Is there a scientific reason why boys make better girls? I'm inclined to say it's because they know what boys like, but I'm not sure. Maybe it's the thought of both fucking a girl and dominating another male at the same time? Getting to creampie them without worrying about pregnancy, patting them on the head while they moan and suckle on your cock, knowing you've officially made a boy into your slutty girlfriend...
I just don't know what it is, but the thought of girls (male) makes me rock hard.