Dolphins

Male dolphins have very special penises, bordering on totally batcrackers. Their penises are retractable, and prehensile, meaning male dolphins can operate their penises with the agility of a hand. That said, they're often terrible at getting it on. Their high sex drives mean that they try and hump a lot of non-dolphin entities, including other animals and inanimate objects. Sounds just like a teenage boy.