Bonobo Monkeys

The Bonobo Monkeys are very possibly the culmination of anyone who believes in reincarnation's hopes and dreams. Sex for a Bonobo is not unlike a smile for a human. Or a handshake, a wink or clearing your throat. Sex is used as a greeting, as a method of conflict resolution and to celebrate when food has been found.
They are the only species that's been observed having sex face to face besides humans, as well as enjoying a little bit of French kissing and oral sex. They also engage in the occasional same-sex wank job and lesbian adventure--even incest. If sex can't fix it, these monkeys don't want to hear about it.