Sex

New research shows that dads really do make less-healthy choices when feeding the family — and this can take a toll on moms.

Diatoms, long thought to reproduce asexually, do engage in sexual reproduction, with ammonium acting as an aphrodisiac.

The percentage of teens in the U.S. who have had sex had ticked down since the 1980s, a new report finds.

Products aimed at regrowing hair cost more when they are marketed to women than when they are marketed to men, a new study finds.

Human sperm cells get an extra oomph forward as they swim, thanks to interconnected elastic springs in their tails that communicate with other regions of the tail, a new study finds.

The number of surgeries done to confirm a person's gender identity, also referred to as sex reassignment surgeries, has increased in recent years.

Just because a judge makes it to the Supreme Court, that doesn't mean the person gets to speak freely: A new study finds that female justices are interrupted more than male justices.

Today's high school seniors believe in gender equality at work, but are becoming more traditional in their beliefs about home life.