Number of sexual partners correlates weakly with divorce and poor mental health at r=-0.2. Divorce lowest with 0-1 premarital partners, highest with 2 or 10+. Associations hold for both men and women. Women averse to promiscuous partners. Twin studies show no causal link from casual sex to depression. Sibling studies reduce nonromantic sex-depression link by 43% after genetic controls. Promiscuity genetically correlates with partner violence (r=0.6), risk-taking (r=0.59), smoking (r=0.51). Personality traits like extraversion, neuroticism, disorderliness link sociosexuality to divorce. Being Black multiplies infidelity odds by 2.44 versus body count's weak 1.011x per partner. Premarital partners predict infidelity after controlling education, race, attitudes. 1-8 partners double divorce odds, 9+ triple them versus virgins. No studies control for personality or genetics in body count-divorce link. Pair-bonding inhibition hypothesis lacks evidence. Humans mostly serially monogamous across societies. Only 30% form lifelong pairbonds. Context of partners matters more than raw count. Failed long-term relationships jade future bonding more than casual sex.