That is incorrect. Perhaps you hadn't noticed, but a rapist is NOT granted that right.If morality is a function of biology and one persons biology urges them to rape, your argument grants them that right...
Do you realise that?
You should probably ask unbelievers what their moral conclusions are rather than telling them and then condemning them for it.
Besides, if we used the values of your bible, we would find that there are times when we may be commanded to rape by the author of those perfected moral laws.