She has officially had enough gin not to be insulted at the mad scientist comparison but also just enough to be very, very confused by the question. "Why on earth would anyone graft extra asses on animals? Either you're talking about an asshole, which giving additional orifices to a digestive tract doesn't make sense, or you're adding the musculature that's supposed to move extra legs, which wouldn't end up with the desired ass shape? Or just random fat lumps vaguely in the shape of a butt?"