Here are three things to consider:
First: It is true that some animals engage in sexual behavior with members of the same sex. However, when human scientists view this, they often read their own agendas into the animals' motives. For example, imagine two scientists observing dogs at a park. If one male dog mounts another, a scientist with an agenda to prove that homosexuality is common in the animal kingdom might consider this behavior as proof for his theory. However, a scientist with experience studying dogs would explain that mounting is an expression of social dominance. Furthermore, animals in heat exhibit all sorts of strange mating behavior. But that does not determine the animal's sexual identity as being "homosexual." One homosexual scientist noted that while some animals do engage in same-sex mating behavior "it seems to be very uncommon that individual animals have a long-lasting predisposition to engage in such behavior to the exclusion of heterosexual activities. Thus, a homosexual orientation, if one can speak of such thing in animals, seems to be a rarity."[1]
Second: It is not true that ten percent of animals are homosexual. Do you really believe that one in ten cats is homosexual? That 10 out of every 100 houseflies are homosexual? That 100 out of every 1000 goldfish are homosexual? If these animals were inherently homosexual, how would they pass this on to future offspring? They would all die out, because nature frustrates homosexuality. It is a self-defeating trait. Dr. Antonio Pardo, Professor of Bioethics at the University of Navarre, Spain, explains: "Properly speaking, homosexuality does not exist among animals.... For reasons of survival, the reproductive instinct among animals is always directed towards an individual of the opposite sex. Therefore, an animal can never be homosexual as such. Nevertheless, the interaction of other instincts (particularly dominance) can result in behavior that appears to be homosexual. Such behavior cannot be equated with an animal homosexuality. All it means is that animal sexual behavior encompasses aspects beyond that of reproduction."[2]
Third: Do animals give us a model for moral living? If some animals practice cannibalism of their young, does this mean anything for humans? Why compare ourselves to the beasts? Why look down to the animals to see how we should live? Why not look up to God, and who he calls us to be? After all, who really wants to pattern their life after animals?
The origins of homosexuality are not simple to understand. Those who have these attractions are often at a loss to explain where they come from. All they know is that they feel this way, and that's where they're at. So we should love them, respect them, and invite them to the live virtue of purity.
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[1]. Simon LeVay, Queer Science: The Use and Abuse of Research into Homosexuality (Cambridge, Mass.: MIT Press, 1996), 207.
[2]. Antonio Pardo, "Aspectos mŽdicos de la homosexualidad," Nuestro Tiempo, Jul.-Aug. 1995, pp. 82-89.