To the contrary, anyone who's seen a herd of bulls when the cows are in heat knows there's a big difference between boys and girls -- and that the difference is principally nature, not nurture. Testosterone is powerful stuff.
> But the whole span of love and sex are covered
> pretty well by other animals, and the physiological
> and even psychological mechanisms are pretty much
> the same across the bored.
I think that different things are covered by different animals. You can aggregate the whole body of 'non-human animals' to say that 'animals in general are the same as humans with respect to how they approach their sex lives.'