I have worked professionally with some homosexuals. The ones I have spoken to about this have said that they have always known that they were attracted more to males, even as a small child. Secondly, the percentage of homosexuality in the various populations around the world is around 4% (except for UK where there is a very very much higher percentage. Especially amongst their cricketers
). Why should it be that regular unless there is a biological determination.
You might also take on board that to be homosexual in the western world can be so difficult that no-one would voluntarily choose that orientation.