Sex

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?

Addyi, the new libido-enhancing pill for women, was approved by the FDA, but many health care professionals are still skeptical about whether women really need the drug.

Your gender might affect how you experience a broken heart.

Studies show women do cry more than men — though not, as Tim Hunt claimed, because they can't take criticism, but because of various biological, social and environmental factors.