Firstly, I've lived with animals all my life, actually. All cats, though. Well, not including the hamsters and fishies. *sigh* Maybe you're right, maybe animal DO want to have sex with humans, and consider them their mates.
However, it is still my opinion that it is morally wrong, based on my personal religion. But if you're not a Christian, or your individual religion doesn't condem it, whatever, go for it, I don't really care if that's what you want to do. It will always be MY opinion that having sex with an animal is sick and wrong, but if that's what you wanna do, I'm not gonna try to fight it with you. I guess it turns out that I feel the same way on this as I feel about some other issues, like homosexuality. I believe it's wrong, based on my religion, but if you don't, it's your life and your body, so do what you want...I wouldn't particularly want my own posterity (hehe, new vocab word) growing up in a world where that kind of thing is tolerated, but it's a free country, so I can't exactly stop anyone, right?