Could it perhaps be both or neither and or something else entirely unknown? No one really understands the causality of human sexuality, no matter how much they wish they did. To me, it doesn't really matter why I am the way I am. What matters to me is that I'm comfortable with myself,my desires, and where I've placed my self in terms of a role in society. Thats my 2 cents anyways :P
“How'd you like to gaze at a beer can throughout eternity? It might not be so bad. There'd be nothing to fear.”