Why do men have an Adam's apple? A biologist explains the puberty hormone surge behind it, the sexual-selection theory and ...

New research suggests that heat stress increases the occurrence of same-sex sexual interactions between male burying ...

Genes associated with male reproductive biology appear to be under relaxed selective constraint in a primate species with low sperm competition.

A Cornell-led study is challenging a decades-old explanation for how chromosomes exchange genetic material within the ...

Think icing your balls will boost testosterone? We asked a urologist to explain what actually works for hormone health and ...

Erection difficulty affects both partners, and you can navigate it together without letting it define your sex life.

Historians have long debated the sexuality of the 16th president, who had a deeply personal relationship with a male friend ...

In a heartbreaking loss for transgender youth and their families, the Supreme Court upheld two laws in Idaho and West Virginia barring transgender women and girls from competing on athletic teams for ...

Retired adult film star, best known for his "daddy" roles in gay and bisexual films, died June 19 after suffering a stroke.

A new study has found substantial regional differences in sperm quality, with men in the highest-performing region recording almost double the total motile sperm count of those in the ...