OK, let me clarify something else - when I said Morality is a human invention, I didn't mean we make it up out of whole cloth. Pain is bad, pleasure is good, being caught deceiving is bad, catching deceit is good... these are biological judgements, provided to us by nature. I guess what I meant is that only humans impose morality upon issues of eat, survive, reproduce. In particular, what religion does to sex is a crime against nature.