Oh, I'm sorry. Because a scientist suggests that animals have been homosexual it must be true. Afterall these scientists have proven evolution. That
was sarcasm just in case you didn't noticed. Check out this link. I'll post a few items from it for ya.
www.narth.com...
Anyone engaged in the most elementary animal observation is forced to conclude that animal "homosexuality," "filicide" and "cannibalism" are
exceptions to normal animal behavior. Consequently, they cannot be called animal instincts. These observable exceptions to normal animal behavior
result from factors beyond their instincts.
To explain this abnormal behavior, the first observation must be the fact that animal instincts are not bound by the absolute determinism of the
physical laws governing the mineral world. In varying degrees, all living beings can adapt to circumstances. They respond to internal or external
stimuli
Second, animal cognition is purely sensorial, limited to sound, odor, touch, taste and image. Thus, animals lack the precision and clarity of human
intellectual perception. Therefore, animals frequently confuse one sensation with another or one object with another.
Third, an animal's instincts direct it towards its end and are in accordance with its nature. However, the spontaneous thrust of the instinctive
impulse can suffer modifications as it runs its course. Other sensorial images, perceptions or memories can act as new stimuli affecting the animal's
behavior. Moreover, the conflict between two or more instincts can sometimes modify the original impulse.
In man, when two instinctive reactions clash, the intellect determines the best course to follow, and the will then holds one instinct in check while
encouraging the other. With animals that lack intellect and will, when two instinctive impulses clash, the one most favored by circumstances
prevails.[4]
At times, these internal or external stimuli affecting an animal's instinctive impulses result in cases of animal "filicide," "cannibalism" and
"homosexuality
I had to help my dogs breed and in the middle the female got loose and the male continued to do his thing on my leg. Does that mean he's bisexual or
gay? Certainly not. Animals are driven by instinctual impulses to breed and those impulses are strong.
I hope these people (the gay haters) don't actually talk to other people in society though. 
