I do however know a lot of gay people (I work in local government)
He he!
I'm inclined to believe that it is hormonal, rather than genetic or nurtured.
I was wondering about this myself. Homosexual behaviour is prevalent throughout the human race and apparently a number of animal ones too. The key issue is what can be defined as homosexual behaviour. Of course a bunch o leather chap wearing mustachioed musclemen getting a bum chain going in a nightclub is very homosexual but what about holding another man's hand, hugging another man or kissing him on the cheek? Or when someone like Wroclaw Boy admires another man's body at the gym, does that make him a botter? If he were living in parts of Asia, he could kiss another man without any comeback but if he did it in Poland or the Uk the chances are he'd attract the wrong sort of attention.
No, there is no such thing as homosexual people, there is only homosexual behaviour, which is in turn defined by one's society. The potential to act like a botter is in all of us but most don't do so because it is considered unacceptable.
The idea of genetically gay people and straight people is repellant. It relegates people with different habits to a different genetic class, usually a lower one.