Quick answer: No, and I'd seriously worry about anyone who did.
Bestiality would probably be a combination of conduct/anti-social personality disorder, paraphilic coercive disorder, and an augmented version of gender confusion that I guess you could call species confusion, though it's not something you'd find in the DSM 4. Someone afflicted with this would need immediate treatment by a well trained professional.
Let me be clear: in my understanding of biology and psychology, bestiality is not something like homosexuality or bisexuality. It is more similar to pedophilia, and it is strictly illegal and for good reason. If you know of anyone who is involved in animal sexuality, it would be best to contact the authorities immediately.
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