Kangaroo Feathers
Yea, it is written in the Book of Cyril...
You're begging the question. First, you need to show that sex is ONLY for reproduction, and then you would need to show that doing something that isn't strictly inline with biological function is "immoral".Strictly biologically speaking the reason for sex is procreation of the species and that only happens with a man and a woman using the correct orifice.
I'll wait.