Sex

Even when people are faced with cold, hard facts, stereotypes hang tight.

Virgins have the lowest divorce rates, while women with exactly two sexual partners have historically had the highest odds of divorce.

A recent study suggests that appearance matters when it comes to income — but putting more effort into how you look has a bigger payoff for women.

Gender-segregated bathrooms originally arose to allow women to travel more widely in public spaces.

Straight men are programmed to love breasts so that they'll play with them during sex, which triggers the woman's maternal bonding circuitry.

Astrophysicist Tyson tweeted: "If there were ever a species for whom sex hurt, it surely went extinct long ago." Sorry Dr. Tyson, evolution don't care if sex is painful.

Getting busy might bring benefits for your brain.

The military has officially opened all combat positions to both men and women, but there are still big differences in the strength of average men and women.

A new federal report argues that gay conversion therapy shouldn't be offered to minors, because there's no evidence it works and some evidence it is harmful.

Some children with a rare genetic condition appear female at birth but later develop a penis and testes around the time puberty begins. But what causes this to happen?