There is no observable "animal homosexuality", it's not scientific in any way to try to lay human sexuality templates over the lower animal's sexual behaviors. My dog likes to hump towels sometimes, does that make him a towellsexual? No. We know why dogs hump towels or dogs of the same sex, it ain't because they find dogs of the same sex hotter than the opposite. It's conflicting stimulu that is confusing their instincts...like smelling a female in heat a couple yards over.
I can't believe people still try this argument.