Health consequences of same and opposite-sex unions: partnership, parenthood, and cardiovascular risk among young adults.

We use the National Longitudinal Survey of Adolescent to Adult Health to examine union and parenthood differences across same and opposite-sex couples in systolic and diastolic blood pressure (SBP and DBP), C-reactive protein (CRP), and abdominal adiposity (waist circumference) among partnered (dating, cohabiting, married) young adults ages 25-33. Relative to women dating men, women cohabiting with women reported lower DBP and were less likely to have high CRP. Mothers reported lower SBP and DBP than non-mothers, but were more likely to have high waist circumference if they lived with a biological or step-child. Among men, nonresidential fathers reported higher DBP than nonfathers, and married men were more likely to have high waist circumference than men dating an opposite-sex partner. Same-sex cohabitation was neither a risk factor nor a health resource for men. Although the sample sizes for same-sex couples are quite small compared with those for opposite-sex couples, this study provides initial insight that occupying a sexual minority status while partnered is associated with some health benefits and few or no health risks relative to those who are dating an opposite sex partner.