If there is something you can choose NOT to do it, (meaning it's a choice), how can you conversely then be a slave to it and unable to refrain from it? If I can say no to it, it's a choice.
Things like your heart beating or flaves eyes being 6" apart are involuntary.
Homosexuality is 100% choice.
I suppose one might say that about everything in life. Some people choose to be celibate, so if some people can do it i guess everyone could do it if they wanted to. I don't think most people could argue that the behavior is not a choice, it's more the predisposition towards it that is being studied.
