Sex

Something's up in bedrooms across America that's driving sexual activity down.

One autumn night while searching for spiders in his backyard, Matthew Persons came across something unexpected: a wolf spider ménage à trois.

Courtship is hard work for a male wolf spider.

A new study reveals how we judge the best dancers. Turns out, hips don't lie.

Move over, vaginal steaming: Actress Gwyneth Paltrow is suggesting an alleged new way to boost your reproductive health: a "jade egg" that's inserted into the vagina

A zebra shark at an Australian aquarium had pups even after living in isolation from males for years.

A monkey was recently seen performing sexual actions on the backs of female sika deer on Japan's Yakushima island.

Accusations of infidelity are quite common in the 2016 election — but how common is infidelity, really?

In two widow spider species, males deploy an ingenious strategy to avoid being cannibalized during sex.

A new study pulls the sheet off millennials' sex lives, revealing that there isn't as much going on as you might expect.

When a woman is more attractive, a man is less likely to intend to use a condom with her, a new study finds.

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

After the June 12 shooting in Orlando, many gay and bisexual men who wanted to donate blood were unable to do so.

Casual hookups may not be good for your love life.

When it comes to sex with a much bigger mate, one type of spider has the problem licked.

Contrary to what daytime talk shows might have you believe, men are rarely hoodwinked into raising children who aren't their own, according to several recent studies.

When a group of researchers crossbred cichlids to learn about their genetics, they discovered an unusual development in one of the hybrid females.

Sex among primates and certain mammals is thought to provide pleasure for the participants. But for many animal species, sex is anything but pleasant.

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.

For male nursery-web spiders, bondage during mating can be a matter of life and death.