From an evolutionary and biological perspective, animals are driven to have sex in order to procreate. But there is a lot more to sexual relations between animals. Animal sex is at least as strange and varied as human sex. A male might copulate with many females. And female animals of many species can be choosy, too. Homosexuality is common. Monogamy is rare. And the animal kingdom is full of swingers. In short, with animals, sex can be wild.
Unlike many other reptiles, alligators use a penis that is always erect and pops out of their bodies to mate.
Strange mating behavior may keep snails from fooling around with other beaus.
While barnacles have extra-long penises to transfer sperm to other stationary barnacles, they broadcast sperm to reproduce with more distant mates