Science of Sex

Prince Harry took an HIV test this week, with the goal of destigmatizing testing for the virus. But exactly who should get screened for HIV, and how often?

A male adult film star in California who underwent regular HIV testing still ended up contracting the virus and infecting two other men before the disease was detected.

It's not just social pressure or political correctness. People really are becoming more accepting of gays and lesbians on a subconscious level.

Gay men who hook up by using smartphone apps may be at higher risk for some sexually transmitted infections than men who find sexual partners through other methods.