Some of the planet's earliest known creatures had no trouble multiplying, even though their sex lives could be described in one word: non-existent.
Less than half of U.S. teenagers today are sexually active, far fewer than in the late 1980s. Continue reading →
A group that wants to make the world's first pornographic film in space has launched a crowdfunding campaign to get the project off the ground.
Male species of the antechinus spend two to three weeks a year in a testosterone-fueled mating marathon.
No sex is required for some mothers in the wild who are reproducing via virgin birth.
Not teaching teenagers the proper use of birth control doesn't prevent them from having sex; it creates a serious public health issue.
Male and female dinosaurs from the same species sported different looks.
The deep-sea dwelling vampire squid could have 100 times more sex than its shallower-residing relatives.
+ Load More