The more I explore the nature of sexuality in the animal world, the more amazed I am at the extraordinary number of ways in which animals show all the diversity of human sexuality, and more. Male dolphins and whales have an extra orifice to penetrate (their partners' blowholes); some primate male couples can indulge in "penis fencing" while hanging from a tree branch (I bet you've never tried that); and female spotted hyenas have a pseudo- phallus that they can (and do) use for penetration. More familiar activities are the usual mounting and penetration, either vaginal or anal, usually from the rear but sometimes from the front, or even the side; masturbation, using hands if they have them, but also flippers or just the ground; oral sex - forms of both fellatio and cunnilingus are known; and just plain cuddling and caressing.
Squirrel ThreesomeRelationships are equally diverse, including long term pair bonds, in both between-sex and same-sex couples, one-off copulation, strictly monogamous and non-monogamous relationships, polygamy, polyandry and group orgies.
Families and child rearing are diverse. There's male and female pederasty, incest, and likewise butch/femme female relationships. There are single parents, between- sex parent couples, and same-sex parent couples, who may acquire kids by finding sperm donors (if female), surrogate mothers (if male), or by adoption. (In some species, male couples turn out to be more successful parents than between-sex parents, just like research suggests for humans).
As in humans, there are a range of "purposes" of sex, from the obvious one of simple pleasure, to asserting domination and status, to procreation. Bonobos even use it as a form of social peacekeeping. There's also a negative side: rape and sexual violence also occur. I confess I've not yet come across the wildlife equivalent of consensual S/M, but I wouldn't be surprised if I did. Just about everything else is there, including transgender (routine in some species), transvestism, and the use of sex toys.
Yes, sex toys, as in dildos and masturbation aids, but instead of visiting a sex store or going on-line, they just make their requirements themselves. Bruce Bagemihl, in "Biological Exuberance" describes numerous examples among the primates, including female Orang-utans and Bonnet Macaques who manufacture their own dildos from plant materials, males who make masturbation aids by forcing a hole in a leaf, and others who simply use natural materials as they find them, twigs, stones, or fruit, for rubbing against their genitals or for inserting into a vagina. (There are not yet reports of male use of dildos, but no doubt that too will be observed some day.)
The use and manufacture of tools by primates is considered an important example of cultural behaviour in animals, and a forerunner of the activities that are so widespread among human beings.although many different forms and functions are evident in animal tool use, these examples show that nonreproductive sexual activities are part of the overall behavioral pattern: the primate capacity for object manipulation extends seamlessly into the sexual sphere.
Similar types of activities occur among people too, of course, and sexual implements of various sorts have a long and distinguished history in human culture. ...Examples have been found from as far back as the Palaeolithic through to medieval times - including some Biblical references - as well as in the ongoing traditions of many indigenous peoples throughout the world.
-Bagemihl, Bruce, Biological Exuberance.
Also see my previous posts, here at Queer Families and at Queering the Church:
The Wildlife Rainbow
Queer Bonobos: Sex As Conflict Resolution
Gay (Wild) -Life
Natural Law and Laysan's Albatross
Bighorn Rams: Macho Homos, Wimpish Heteros
At Seed Magazine: Sex At Dawn The effeminate sheep and other problems with natural selection
Bagemihl, Bruce: Biological Exuberance: Animal Homosexuality and Natural Diversity (Stonewall Inn Editions)
Roughgarden, Joan: Evolution's Rainbow: Diversity, Gender, and Sexuality in Nature and People
Sommer, Volker and Vasey, Paul: Homosexual Behaviour in Animals: An Evolutionary Perspective