it's a useless thing to discuss the validity of such arguments..
there are about billions of us here on earth confused as to who we are..theorizing and philosophizing as to our purposes may them be biological or spiritual or what... I think some of these characteristics, less common they are the worse, are stereotyped and as unhealthy by the majority so that they could feel secure within their frames of reference.
what I think is, all references are equally natural and are inspired by equally valid impulses or genes or whatever they may.. easiest to do would be to let and let live.
for those who are concerned about the survival of the species, I guess extinction due to lack of straight sex is a bit far fetched..