A pregnant goldfish is called a twit.
If you keep a goldfish in the dark room, it will eventually turn white.
The male praying mantis cannot copulate while its head is attached to its body. The female initiates sex by ripping the male’s head off.
Humans and dolphins are the only species that have sex for pleasure.
The Ramses brand condom is named after the great Pharaoh Ramses II who fathered over 160 children.