Humans aren't the only ones who perform oral sex. Cheetahs, hyenas and goats all go down.
When mating, the male octopus tears off his arm (the one that's also a penis), places it in the female, and then swims off to die.
Male dolphins have been known to keep females hostage and not feed them until the female agrees to have sex with them.
Bats have been witnessed engaging in oral sex. Researchers say they may use this to help their partners last longer.
Male llamas have a separate set of fighting teeth. They are used to attack and bite the testicles off of other males.
Female Stingrays have the ability to store sperm for long periods of time to become pregnant whenever they want.
Female koalas often engage in lesbian orgies when kept in captivity.
Penguins have one mate throughout their entire life and sometimes they `propose` by giving their mate a pebble.
Seahorses will flirt with as many as 25 potential partners in a day. About 37% of a seahorse's sexual encounters involve the same sex.
The males of some species create a "mating plug" after sex which prevents other males from having sex with the same female.