If you took the time to talk to some people who are homoloveual you would discover that it is far more than just a 'behaviour'. For instance, there are many homoloveuals who do not exhibit homoloveual behaviour, yet that does not mean they are heteroloveual
While I certainly do not claim to be an expert in this area, I have had the opportunity to discuss issues of loveual attraction and behaviour with a fair number of both male and females who clbuttified themselves as homoloveual, or were going through the process of working out the direction of their loveual orientation. Some of them had not begun to practice the loveuality of their preference (that is often why they consulted me) but in all cases it was clear that they had a loveual attraction to the same love. Some were biloveual.
In essence, homoloveuality is not about behaviour, but rather a state of mind, which may or may not be acted upon.
I certainly do not pretend to know the whys and hows of homoloveuality, but all my clients (and a few homoloveual friends) all were of the view that they had always known at some level that they were different to their same love peers. But for some it was only in their later years that they were able to talk about their preferences and attractions.
David