The relationship between sexual sensation seeking and problematic Internet pornography use: A moderated mediation model examining roles of online sexual activities and the third-person effect.

BACKGROUND AND AIMS: Internet pornography consumption is prevalent among college students and problematic for some, yet little is known regarding the psychological constructs underlying problematic Internet pornography use (PIPU). Drawing on the Interaction of Person-Affect-Cognition-Execution model, this study tested a model that sexual sensation seeking (SSS) would impact PIPU through online sexual activities (OSAs) and that this relationship would be influenced by the third-person effect (TPE; a social cognitive bias relating to perceived impacts on others as compared to oneself) in a gender-sensitive manner.
METHODS: A total of 808 Chinese college students (age range: 17-22 years, 57.7% male) were recruited and surveyed.
RESULTS: Men scored higher than women on OSAs and PIPU and on each scale's component factors. The relationship between SSS and PIPU was mediated by OSAs, and the TPE moderated this relationship: the predictive path (SSS to PIPU) was significant only in participants with high TPE. The moderated mediation model was not invariant across gender groups, with data suggesting that it accounted for a greater proportion of the variance in men as compared with women. DISCUSSION AND
CONCLUSIONS: The findings suggest that SSS may operate through participation in OSAs to lead to PIPU, and this relationship is particularly relevant for college-aged males scoring high on the TPE. These findings have implications for individuals who might be particularly vulnerable to developing PIPU and for guiding educational efforts and targeting interventions in college-aged students. The extent to which these findings extend to other age groups and cultures warrants further examination.

Introduction

The use of the Internet for sexual exploration is prevalent with 13% of terms entered in Internet search engines relating to sex (Ogas & Gaddam, 2011). About 90% of adults in mainland China have been engaged in online sexual activities (OSAs) over a 6-month period (Li & Zheng, 2017; Zheng & Zheng, 2014). Many college students reported experience in accessing sexual information (89.8%) and sexual entertainment (76.5%) online, and almost half of them (48.5%) reported browsing sexual products (Döring, Daneback, Shaughnessy, Grov, & Byers, 2017). In most cases, pornography viewing is not associated with interference in major areas of life functioning. However, for some, it may become problematic and be associated with negative consequences (Ford, Durtschi, & Franklin, 2012; Weaver et al., 2011). For these reasons, it is important to investigate the potential mechanisms that may contribute to the development and maintenance of problematic Internet pornography use (PIPU).

Similar to gambling disorder or other excessive online activities, dysfunctional involvement in online pornography use has been conceptualized as a “behavioral” addiction (Cooper, Delmonico, Griffin-Shelley, & Mathy, 2004). PIPU appears to share several core features with other addictive behaviors (Brand et al., 2011). It typically involves poorly controlled and excessive use, strong desires, motivations and craving, obsessive thoughts, and continued engagement despite adverse consequences, which, in turn, lead to significant personal distress and functional impairment (Cooper et al., 2004; Kor et al., 2014; Wéry & Billieux, 2015). PIPU may have elements related to both problematic Internet use (PIU) and sexual addiction (Griffiths, 2012) or compulsive sexual behavior disorder (Kraus et al., 2018), perhaps as a specific subtype of each (Brand, Young, & Laier, 2014; Young, 2008).

As a potential personality trait, sexual sensation seeking (SSS) has been suggested to lead to PIPU (Perry, Accordino, & Hewes, 2007). SSS refers to tendencies to try unique and novel sexual experiences to achieve high degrees of sexual arousal (Kalichman et al., 1994). It has been associated with hypersexuality (Walton, Cantor, Bhullar, & Lykins, 2017), risky sexual behaviors (Heidinger, Gorgens, & Morgenstern, 2015), and high frequency of OSAs (Lu, Ma, Lee, Hou, & Liao, 2014; Luder et al., 2011; Peter & Valkenburg, 2011; Zheng, Zhang, & Feng, 2017; Zheng & Zheng, 2014). Hence, SSS is an important variable to study the development of PIPU. Yet, the mechanisms by which SSS may lead to PIPU remain unclear. An improved understanding of such mechanisms could facilitate practical guidance to individuals and healthcare practitioners and educators on how to develop intervention strategies (MacKinnon & Luecken, 2008). To understand the implications of SSS for PIPU completely, research should investigate the potential causal pathways that are involved in the process by which SSS-related impacts unfold (i.e., mediation). Second, the models should illuminate contextual factors on which SSS-related impacts depend (i.e., moderation). Consequently, this study investigates relationships between SSS and other factors that may explain mechanisms by which SSS may lead to PIPU (mediation) and factors that may influence these pathways (moderation).

To understand relationships between SSS and PIPU in more detail, we draw on the Interaction of Person-Affect-Cognition-Execution (I-PACE) model of specific Internet-use disorders (Brand et al., 2014; Brand, Young, Laier, Wölfling, & Potenza, 2016). The model posits that the development and maintenance of specific forms of PIU may be driven by a person’s core characteristics (needs, goals, specific predispositions, and psychopathology) and influenced by a person’s cognitions, and these may lead to specific behaviors such as OSAs. If an individual achieves gratification from the behavioral engagement, it may become reinforced and repeated; in the case of OSAs, this may then lead to PIPU, consistent with existing data relating sexual satisfaction, cybersex, and PIPU (Lu et al., 2014). Addiction models also posit that sensation-seeking tendencies linked to positive reinforcement motivations are related to addictive behaviors (Steinberg et al., 2008). As the Internet contains many opportunities for engaging in OSAs (relating to pornography viewing, sharing of sexually explicit materials, etc.), individuals with higher SSS, who are looking for novel sexual stimuli, may be particularly vulnerable to developing PIPU through their engagement in OSAs. The I-PACE model provides a theoretical explanation for the impact of SSS on PIPU. Consistent with this notion, the relationship between the frequencies of OSAs and PIPU has been observed to be positive (Twohig, Crosby, & Cox, 2009). Other researchers have proposed that the frequency of pornography use is an important consideration in PIPU development (Cooper, Delmonico, & Burg, 2000; Cooper et al., 2004), but it is not the sole criterion for problematic use, particularly if the behavior is controlled in the setting of other priorities and not leading to harm or distress (Bőthe et al., 2017; Kor et al., 2014; Wéry & Billieux, 2015).

The I-PACE model considers that the Internet-related cognitive biases may include false beliefs about the possible effects of using certain applications/sites. The perception that media exerts a stronger effect on others than on oneself has been termed the third-person effect (TPE) and perceiving influences on oneself to be greater than those on others has been called the first-person effect (Davison, 1983). According to the I-PACE model, cognitive biases may act in concert with users’ predisposing characteristics, accelerate the intensities of cue-reactivity and desire, and promote the use of special applications/sites (Brand, Young, et al., 2016). With particular relevance to this study, people who report higher levels of SSS have been reported to be more individualistic (Gaither & Sellbom, 2003), and the individualism may promote the belief that Internet pornography may have more negative influences on others than on themselves (Lee & Tamborini, 2005). The TPE may lead to a lower awareness regarding negative consequence of Internet pornography and thus may be positively linked to the development of PIPU.

In this theoretical framework, we sought to examine whether the impact of SSS on PIPU is mediated by OSAs and whether this relationship is moderated by the levels of the TPE. Therefore, we constructed a moderated mediation model (Figure 1). Given that significant gender-related differences exist in OSAs and PIPU (Kor et al., 2014; Turban, Potenza, Hoff, Martino, & Kraus, 2017), and male engagement in potentially addictive behaviors is linked more strongly to positive-reinforcement motivations than female engagement (Potenza et al., 2012; Zakiniaeiz, Cosgrove, Mazure, & Potenza, 2017), we examined the extent to which the model was sensitive to gender.

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Hypothesis model. SSS: sexual sensation seeking; TPE: third-person effect; PIPU: problematic Internet pornography use; OSA: online sexual activities

Methods

Participants and procedures

The data were collected in the period between November 2016 and March 2017 from a sample of Chinese college students through an online-based survey. A total of 808 college students [466 men, 342 women; Mage = 18.54 years, standard deviation (SD) = 0.75] were recruited through the Chinese professional survey website (www.sojump.com). No monetary incentives were provided for participation. The volunteers were from key public universities (n = 276), first-tier universities (n = 200), second-tier universities (n = 150), community colleges, and vocational colleges (n = 182). Anonymity of the participants was protected (no personal data or Internet protocol addresses were collected).

Outcome measures

The PIPU Scale (PIPUS) is a 12-item self-report scale that is based on the Problematic Pornography Use Scale (Kor et al., 2014) and was used to assess PIPU. The scale consists of four factors including (a) distress and functional problems, (b) excessive use, (c) self-control difficulties, and (d) use in order to escape or avoid negative emotions. In this study, “pornography” was modified into “Internet pornography” from the original scale. Each factor of the PIPUS includes three items. Respondents were asked to report on their Internet pornography use in the last 6 months on a 6-point Likert scale ranging from 0 (never) to 5 (all the time) with higher scores reflecting greater PIPU severity. Cronbach’s α values for these four factors and the total score in this study were .78, .85, .90, .87, and .94. The Chinese version of the scale has been found to be reliable and valid among Chinese college students (Chen, Wang, Chen, Jiang, & Wang, 2018).

OSAs were assessed using 13 items from a scale that measured participants’ use of the Internet for (a) viewing sexually explicit material, (b) seeking sexual partners, (c) cybersex, and (d) flirting and relationship maintenance (Zheng & Zheng, 2014). Assessed items were rated from 1 (never) to 9 (at least once a day). Higher scores reflected more frequent engagement in OSAs. The viewing of sexually explicit material section included five items about visiting erotic websites, viewing and downloading erotic videos online, and reading erotic material online (Cronbach’s α = .86). There were two items that measured the frequency of seeking sexual partners, including the number of sexual partners sought and the number of sexual partners found online (Cronbach’s α = .70). Frequency of cybersex was assessed using four items including masturbating or viewing strangers masturbating via a webcam, describing real-time sexual fantasies via typing or voice, and exchanging erotic pictures online (Cronbach’s α = .80). Flirting and sexual relationship maintenance were measured using two items (Cronbach’s α = .64). Cronbach’s α of the whole scale was .89.

The TPE was measured by asking two separate questions: “How much influence does Internet pornography have on you/other students at your university? (e.g., influence on your/others’ sexual morality and attitudes toward the opposite sex),” according to the definition of Davison (1983), Lo, Wei, and Wu (2010), and Zhao and Cai (2008). Participants answered these questions on a 7-point scale, from 1 (no influence at all) to 7 (a great deal of influence). TPE scores were derived by subtracting perceived influence on self from perceived influence on other students with greater than 0 representing a TPE and less than 0 representing a first-person effect (Golan & Day, 2008). In order to reduce test cross-reference influences, the two items were imbedded in the two parts of the questionnaire.

The Sexual Sensation Seeking Scale (SSSS) was developed by Kalichman et al. (1994) to measure the degree of SSS. The SSSS is an 11-item Likert-type measure with response options ranging from 1 (not at all like me) to 4 (very much like me). The 11-item scale includes statements such as, “I am interested in trying out new sexual experiences” and “I feel like exploring my sexuality.” Higher scores reflect stronger SSS tendencies. The internal consistency (Cronbach’s α) of the SSSS was .92.

Statistical analysis

Gender-related differences in clinical characteristics were examined using one-way multivariate analyses of variance (MANOVAs). Controlling for age and gender and partial correlation analyses were employed to measure the strengths of relationships between the main research variables including PIPU, OSAs, SSS, and TPE. Mplus7.2 was used to assess the moderated mediation model of SSS and PIPU and the potential variance of the model by gender. We estimated the significance of standardized coefficients with 1,000 bootstrap iterations. In this study, standard errors and confidence intervals of parameter estimations were obtained. If the 95% confidence intervals did not contain zero, the findings were considered statistically significant.

Ethics

The study protocol and materials were approved by the ethical committee of the Institute of Psychological and Cognitive Sciences, Fuzhou University, China. All subjects were informed about the study and all provided informed consent.

Results

Descriptive statistics for the variables

Among the whole sample, mean score was 7.13 for PIPU (SD = 8.48, skewness = 1.97, and kurtosis = 5.55) and for frequency of OSAs 1.70 (SD = 0.94, skewness = 2.84, and kurtosis = 12.34). Men had higher scores on the PIPUS and engaged in OSAs more frequently when compared to women (Table 1). Further analysis [one-way MANOVA with the scores of the four OSA subscales, multivariate F(4, 803) = 26.12, p < .001, partial η2 = 0.12, and the four PIPUS sub-scales, multivariate F (4, 803) = 12.91, p < .001, partial η2 = 0.06, respectively] demonstrated that this pattern extended to each scale’s component factors.

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Descriptive statistics, gender-related differences, and correlation coefficients (r’s) among variables

		All participants (N = 808)	Men (n = 466)	Women (n = 342)	1	2	3
		M (SD, skewness, kurtosis)	M (SD, skewness, kurtosis)	M (SD, skewness, kurtosis)
1	PIPU	7.13 (8.48, 1.97, 5.55)	8.82 (9.27, 1.84, 4.96)	4.81 (6.60, 1.92, 3.68)***
2	OSAs	1.69 (0.93, 2.84, 12.34)	1.92 (2.57, 1.97, 10.46)	1.38 (0.66, 3.48, 16.15)***	0.60***
3	SSS	20.80 (7.59, 0.34, −0.60)	22.16 (7.57, 0.18, −0.71)	19.02 (7.28, 0.71, −0.04)***	0.45***	0.50***
4	TPE	0.84 (1.57, 0.74, 1.57)	1.02 (1.67, 0.49, 0.71)	0.58 (0.38, 1.91, 3.55)***	0.34***	0.55***	0.30***

Note. SD: standard deviation; PIPU: problematic Internet pornography use; OSAs: online sexual activities; SSS: sexual sensation seeking; TPE: third-person effect.

***Findings in women indicates that there is a significant difference between men and women in this variable at p < .001; the correlation coefficient is the partial correlation coefficient after controlling for age and gender.

***p < .001.

Relationships between SSS, TPE, OSAs, and PIPU

Pearson’s partial correlation coefficients between PIPU, OSAs, SSS, and TPE are shown, controlling for age and gender (Table 1). PIPU total score and its factors were highly correlated with OSAs. As might be expected, correlations with PIPU scores were typically numerically most robust for viewing sexual explicit material (r = .65, p < .001) and least robust for flirting and relationship measures (r = .21, p < .001). Both SSS and TPE were positively correlated with OSAs and PIPU measures and with each other. The results suggest that with greater SSS, there was increased likelihood of engagement in OSAs and use of Internet pornography problematically.

The influence of SSS on PIPU: OSAs as a mediating factor and TPE as a moderator

According to Edwards and Lambert (2007), it is necessary to test the parameters of the three regression equations in the intermediate model with moderated front paths: (a) Equation 1 tests the regulating effect of the variable (TPE represented by U) on the independent variable (SSS represented by X) and the dependent variable (PIPU represented by Y). (b) Equation 2 estimates the regulatory role of the moderating variable (TPE) on the independent variable (SSS) and intermediary variables (OSA represented by W). (c) Equation 3 tests the moderating effect of the moderator (TPE) on the relationship between the independent variable (SSS) and intermediary variable (OSA), and mediating effects of the intermediary variable (OSA) on the dependent variable (PIPU represented by Y). The values of SSS and TPE were z-standardized to z-scores, and then these two z-scores were multiplied as points of interaction (Dawson, 2014).

As shown in Table 2, in Equation 1, the interaction effect of SSS and TPE significantly predicted PIPU (c3 = 0.42) and hence the further analyses were conducted. In Equation 2, the path of the interaction of SSS and TPE was significant (a3 = 0.37). In Equation 3, the path from OSAs to PIPU was significant (b1 = 0.56), and both a3 and b1 were significant. In addition, a1 and b2 and a3 and b2 were all significant, which met the testing criteria (Edwards & Lambert, 2007). At the same time, as shown in Table 2, in Equation 3, the moderating model had increased 8.9% variable explanatory volume compared with Equation 1, which supported the mediating role of OSAs in the impact of SSS on problematic use. The hypothesized model in Figure 1 was thus tested and supported.

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Three steps to investigate models of sexual sensation seeking relationships to PIPU (estimated by bootstrapping)

	Equation 1 (dependent variable: Y)				Equation 2 (dependent variable: W)				Equation 3 (dependent variable: Y)
Variable	B	SE	β	95% CI	B	SE	β	95% CI	B	SE	β	95% CI
X	0.41 (c1)***	0.04	0.42	[0.34, 0.48]	0.33 (a1)***	0.04	0.33	[0.26, 0.41]	0.07	0.04	0.07	[−0.01, 0.14]
U	0.19***	0.03	0.20	[0.13, 0.26]	0.40***	0.05	0.42	[0.31, 0.51]	0.33***	0.03	0.36	[0.27, 0.38]
UX	0.16 (c3)**	0.05	0.20	[0.04, 0.25]	0.30 (a3)***	0.06	0.37	[0.18, 0.42]	0.20 (b2)***	0.03	0.15	[0.05, 0.18]
W									0.56 (b1)***	0.03	0.50	[0.49, 0.62]
Gender	−0.34***	0.07	−0.14	[−0.49, −0.21]	−0.53***	0.10	−0.16	[−0.76, −0.36]	−0.10***	0.02	−0.04	[−0.14, −0.06]
Age	−0.08*	0.03	−0.07	[−0.15, −0.02]	−0.04	0.04	−0.03	[−0.12, 0.03]	0.06*	0.03	−0.05	[−0.10, 0.01]
R2 (%)	36.5				63.1				45.4

Note. The 95% interval of all predictive variables was obtained by bootstrapping. X: sexual sensation seeking; Y: problematic Internet pornography use; W: online sexual activities; U: third-person effect; SE: standard error; CI: confidence interval; PIPU: problematic Internet pornography use.

*p < .05. **p < .01. ***p < .001.

From Table 2, the positive coefficient of the interaction term suggested that it became more positive as the TPE increased. To enable easier interpretation, we plotted the relationship so it may be viewed visually. We divided the individuals’ scores into high and low groups in accordance with a SD above and below the mean (Dawson, 2014). The results showed that for the participants with high TPE (with scores a SD above the mean), SSS could positively predict OSAs (β = 0.71, t = 6.13, p < .01), whereas for the participants with low scores on the TPE (with the scores of a SD under the mean), the predictive effect of SSS was not significant (β = −0.04, t = 0.27, p = .79; Figure 2).

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Relationships between SSS, TPE, and OSAs

Multiple group invariance test of the model in men and women

Measurement invariance was employed to examine the moderated mediation model across the two genders. Multigroup invariant tests usually require several steps, including the gradual addition of constraints (qualifying additional parameters to be equal) in each step to complete the overall testing, using the fit indicator difference as criteria to test whether the equal assumption hurts the performance of model fitting. If the fitting indices are not ideal, it is stated that there is no equivalent structure between the two groups and the test is stopped (Lomazzi, 2018). The first step is the configural invariance test (the baseline model) where no parameters are set for cross-group equality to see if the model “looks” the same in both groups. In this step, the results showed that the suitability indexes of the model were: χ2 = 703.11, df = 77, p < .001, comparative fit index (CFI) = 0.86, Tucker–Lewis index (TLI) = 0.81, and root mean square error of approximation (RMSEA) = 0.14. It illustrated that the baseline model was rejected, which meant that at least the structural equation model of one group should be modified. In step zero, the baseline models were also estimated for both males and females, showing a good fit in male subjects (χ2 = 101.72, df = 29, p < .001, CFI = 0.97, TLI = 0.95, and RMSEA = 0.073) but not in female subjects (χ2 = 216.256, df = 29, p < .001, CFI = 0.90, TLI = 0.82, and RMSEA = 0.14). This finding suggested that the moderated mediation model depend on gender. The variation interpretation of the model was 57.5% among men and 32.5% among women (Table 3).

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Comparison of path coefficients of the moderated mediation model between men and women

Independent variables	Dependent variables	Path coefficient				Critical ratios	p
		Men (β)	SE	Women (β)	SE
SSS	OSAs	0.39	0.05	0.40	0.06	1.89	.059
TPE		0.45	0.05	0.47	0.07	−6.85	.000
SSS × TPE		0.33	0.08	0.60	0.07	−27.10	.000
SSS	PIPU	0.17	0.07	0.03	0.06	14.89	.000
TPE		0.09	0.03	0.13	0.03	10.75	.000
SSS × TPE		0.004	0.06	0.24	0.08	14.38	.000
OSAs		0.74	0.11	0.89	0.07	−1.95	.258

Note. The β is the standardized path coefficient. The p values of “.000” correspond to p < .001. SSS: sexual sensation seeking; PIPU: problematic Internet pornography use; OSAs: online sexual activities; TPE: third-person effect; SE: standard error.

Discussion

In this study, we tested relationships between TPE, SSS, OSAs, and PIPU in young adult college-attending men and women from China. Specifically, we tested a moderated mediation model embedded within the I-PACE theoretical framework within the context of the PIU and addiction literatures. Previous research has examined the influences of negative reinforcement (i.e., escape or avoidance of depression and anxiety through pornography viewing) on the development of PIPU (Paul & Shim, 2008). While several studies have also investigated the aspects of positive reinforcement and SSS as related to PIPU (Steinberg et al., 2008), mechanistic explanations for relationships between SSS and PIPU have been largely lacking. To advance knowledge in this area and offer more specific guidance to individuals, therapists and educators, this study demonstrates that SSS exerts its influences on PIPU through OSAs, is moderated by the TPE, and seems to be mainly applicable to males. Specifically, we found that SSS leads to more frequent OSAs typically when individuals perceive influence on others as greater than those on themselves, which provides more detailed and specific explanations of when, or under what conditions, SSS may lead to more OSAs and subsequently PIPU. Furthermore, this pathway accounted for greater variance among men than women. Thus, our hypotheses were largely supported and the implications are listed below.

The moderated mediation model indicates that the relationship between higher SSS and PIPU operates through more frequent OSAs, consistent with prior findings (Hong et al., 2012; Zheng & Zheng, 2014). Sensation seeking is a tendency frequently associated with addictive behaviors (Steinberg et al., 2008). As an important component of sensation seeking, SSS reflects a tendency to seek risky, exciting, and novel sexual experiences. The findings are consistent with the notion that the Internet may attract particular users of pornography, especially male college students high in SSS because of its novelty, anonymity, low cost, and easy access (Cooper et al., 2000). For individuals with high SSS, the Internet may represent a new way to satisfy the desires of seeking novel sexual stimulation, get pleasure, and relieve pain related to the suppression of sexual impulses, then generate a conditioned behavioral pattern (Putnam, 2000) in consistent with the I-PACE model (Brand, Young, et al., 2016). Nonetheless, such a conditioned relationship could make it increasingly hard for an individual to control one’s use of Internet pornography, even though negative consequences related to overuse may be occurring. Furthermore, it has been suggested that users, perhaps those high in SSS, who have certain sexual fantasies that may be satisfied by Internet pornography better than by real-world sex may be at particular risk for developing PIPU (Brand, Snagowski, Laier, & Maderwald, 2016; Cooper et al., 2000, 2004). These possibilities warrant direct examination in future studies, for example, by including measures of sexual expectancies in longitudinal studies of Internet pornography use.

The current findings indicate that individuals who believe that Internet pornography may have damaging effects more on others than on themselves were more likely to engage in OSAs and thus experience PIPU. According to Perloff’s (2002) “self-expanding” mechanism, people may tend to highlight a “super-self-image” both internally and externally to protect and improve “the self.” The extent to which this theory may explain tendencies to potentially deny or underestimate the effects of pornography consumption and how this may relate to developing PIPU warrant additional research (Sun, Pan, & Shen, 2008). Furthermore, as individuals with high SSS may have greater individualistic tendencies, their characteristics may lead them to pay more attention to their own experiences, and this may strengthen the self-other cognitive bias on the influence of Internet pornography, thus promoting beliefs that they may not be negatively affected (Lee & Tamborini, 2005).

Multigroup invariance testing showed that the model tested in this study did not apply equally across genders with the model applying to males more so than females. First, males tend to pursue more varied sexual experiences (Oshri, Tubman, Morganlopez, Saavedra, & Csizmadia, 2013); they also report more sexual arousal (Goodson, McCormick, & Evans, 2000), sexual excitement, and masturbation when browsing pornographic materials online with females reporting more avoidance, disgust, or worries (González-Ortega & Orgaz-Baz, 2013). Therefore, males, particularly those high in SSS, may be more likely to seek novel sexual stimulation online that may lead to PIPU. Second, emotional factors may be more important in relation to sexual behaviors for females when compared to males (Cooper, Morahan-Martin, Mathy, & Maheu, 2002), but most sexual explicit materials available online may be less desirable for females (Gonzalez-Ortega & Orgaz-Baz, 2013). Finally, women also in general view pornography more negatively than men (Malamuth, 1996). Therefore, in this multiple model, the functions of SSS and the TPE may vary for multiple reasons, and these possible reasons should be examined in future studies.

Our findings have potential implications for sexual education, prevention of PIPU, and Internet media regulation. First, the study found that SSS may predict OSAs and PIPU, particularly in men who have high SSS. SSS should be examined further and in educational contexts, it may be particularly important to instruct individuals as how best to understand and meet their own sexual needs in healthy fashions. Such efforts may occur best prior to college in sex education during adolescent or earlier periods, given that the proportion of youth as young as 10 years of age who views pornography may be rising (Peter & Valkenburg, 2016). Second, the influence of the TPE suggests that education regarding the potentially harmful effects of Internet pornography may help reduce the likelihood of developing PIPU. Such educational efforts may involve education about young men who report that Internet pornography viewing has altered their sexual arousal templates and led to erectile dysfunction (Wéry & Billieux, 2016). Finally, the psychological mechanisms of relating to male and female engagement in OSAs and development of PIPU may be different. Therefore, educational guidance and evaluation efforts may need to be tailored in gender-sensitive fashions, with particular emphasis on SSS in males and perhaps other domains (e.g., relating to emotional and social aspects) being more relevant to females, although this latter point is currently speculative based on the recent findings.

Our results should be considered in light of study limitations. The survey did not employ random sampling and was Internet-based, and these features could limit the generalizability of the findings. Second, participants were college students from China. While pornography consumption is very relevant to this group, the extent to which the findings may generalize to other young adults and age groups, groups with less education, and other jurisdictions and cultures warrants additional investigation. Third, as other factors have been linked to OSAs and PIPU, such as low self-esteem (Kor et al., 2014), craving (Kraus, Martino, & Potenza, 2016), and poor emotion-regulation strategies (Wéry & Billieux, 2015), these should be examined in future studies. Despite these limitations, the study provides important data supporting and refining proposed theoretical models for specific forms of PIU and suggests important avenues for educational and interventional strategies to reduce the prevalence of harms associated with PIPU.