Same-sex sexual behavior might have started out on an equal footing with different-sex sex.
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.
Little is known about the mating behaviors of arctic-loving narwhals, also called the unicorns of the sea.
The cringe-worthy sexual behaviors of bed bugs involve traumatic insemination, no courtship activities and, sometimes, incest.
Hummingbird mating involves using specialized courtship rituals, tail feathers that sing, and weaponized beaks.
For Valentine’s Day, Live Science gathers together some of the more extravagant and outlandish courtship rituals in the animal kingdom.
Chicken mating involves tidbitting, wing-flapping, a male waltz and the possibility of the female ejecting the male's sperm.
A monkey was recently seen performing sexual actions on the backs of female sika deer on Japan's Yakushima island.
Though nine-banded armadillos are solitary creatures, they do occasionally get together for some genital sniffing, tail wagging and clucking in order to have sex.
Male dark fishing spiders spontaneously die after sex — but their nutritious bodies provide fuel for their mates to have more offspring that are larger and healthier.
Mating in these strange-looking mollusks lasts for 2 to 3 hours, but it's unclear what exactly is going on during this time.
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