My theory is that the way most gays become gays is that they are introduced to it at a young age. The intense physical pleasure that was designed to reinforce a marriage then becomes associated with the same sex and voila a new gay person.
We don't know if that senior was the 14 year olds first or not. If she was, then she is responsible for probably permanently warping the 14 year old.
You need to go no further than NAMBLA's motto: "Get 'em before eight, or it's too late!"
What about the ones that weren’t introduced to it?