In 2005, a psychologist and an economist taught a group of monkeys the concept on money - Soon, the monkeys began to engage in prostitution.
Penguins have been known to engage in "prostitution." They will have sex with males in exchange for food and pebbles.
Male ducks literally shed and regrow their penises.
Earthworms are hermaphrodites. They have both male and female parts. But they cannot impregnate itself.
The female Orb-web spider eats the male during sex, but the male's penis is detachable and still finishes the job.
Female porcupines have been witnessed using wooden sticks as "dildos."
The male spiny anteater has a 4-headed penis.
Only female humans and horses have hymens.
Honey bees testicles explode during sex and then they die!
Hippos attract mates by urinating and defecating.
