Even dog breeders know it's a bad idea. Rationalize it all you want...consensual, no kids, contraception, fucking whatever dumb little thought crawls into your idiot brain box. At the end of the day it's still sick and wrong. If you see it any other way, you are one seriously fucked up individual. I suggest you strap on your helmet, get to the back of the bus and stick your head out the window like a good little idiot.