[bsanr2]

If natural law is a form of genetic determinism, as you suggest, genetic variation and diversity would lead to not one singular set of natural laws, but a spectrum of them. Collectively-held rights cannot be derived directly from this broad spectrum; natural rights serve as a medium through which felt natural law may be applied practically and collectively. It is thus wrong to speak of "natural law" as a justification for socially-permissible action; you are only doing as you wish, with no regard for how others feel.

Again, when you do so, you must understand that others have no obligation to tolerate it.