I hope I didn't scare you away, but there are evidences that animals do perform homosexual activities with each other such as monkey, apes, dolphins, insects, whales, and other animals.
You can look up on
The Natural "Crime Against Nature": Homosexual Behaviors In Animals
amen
BBC NEWS | Europe | Oslo gay animal show draws crowds
Bonobo, an ape, is our second farther cousin use sex or masturbation to release tensions.
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One explanation for the sexual activity at feeding time could be that excitement over food translates into sexual arousal. This idea may be partly true. Yet another motivation is probably the real cause: competition. There are two reasons to believe sexual activity is the bonobo's answer to avoiding conflict.
First, anything, not just food, that arouses the interest of more than one bonobo at a time tends to result in sexual contact. If two bonobos approach a cardboard box thrown into their enclosure, they will briefly mount each other before playing with the box. Such situations lead to squabbles in most other species. But bonobos are quite tolerant, perhaps because they use sex to divert attention and to diffuse tension.
Second, bonobo sex often occurs in aggressive contexts totally unrelated to food. A jealous male might chase another away from a female, after which the two males reunite and engage in scrotal rubbing. Or after a female hits a juvenile, the latter's mother may lunge at the aggressor, an action that is immediately followed by genital rubbing between the two adults. “
Bonobo ( 'Pygmy Chimpanzee' ) sex and society