This *should* end the argument about choice: Why would anyone *choose* to be gay?
However, I know those people who believe it is a choice will come up with some zany answer to refute this. In fact, the way I see it is, if you think it possible, than you must be at least bisexual, because only a non-straight person would think this. Straight people are not attracted to other members of the sex, and would never try it, because it would be to repulsive. Thusly, they must understand that if other people are willing to try it, - then it can't be a choice issue, now can it?
Bullsh**t. The Greeks were then all bisexual. It doesn't work that way. You're taught to like it or not, and it is a decision. And a fun one at that.
