The menstrual cycle and sexual behavior: relationship to eating, exercise, sleep, and health patterns.

Patterns of eating, exercise, sleep, and health were investigated across 180 menstrual cycles of 89 women who engaged in sex with a male (n = 45; cycles = 85), a female (n = 21; cycles = 37), or abstained from sex (n = 33; cycles = 58) from January 2005 to December 2007 (10 contributed to 2 groups). Cycles were divided into 5 phases based on their luteinizing hormone surges. Daily questionnaires and saliva for IgA and cortisol analyses were obtained. Women indicated that they ate more (p < .008) and did not sleep as well (p = .02) during their luteal and premenstrual phases. Participants were less likely to experience food cravings and did not satisfy their cravings when they were ovulatory (p < .001). Additionally, a greater proportion of lesbians skipped breakfast (p = .01) and exercised less than heterosexuals (p = .05). Sexually active women had lower cortisol and IgA levels than abstinent women (p = .02). Our study discovered, and confirmed, systematic differences in eating, sleeping, and health patterns across women's menstrual cycles.