It is a well known fact that almost anything can turn you gay. This is why even one good hot fuck (voluntary or involuntary) with a guy is so dangerous. You could be as straight as they come, and just once let your guard down. Say some masseur spills heated oil into your butt crack. Bingo--the next thing you know you are deliriously gay with some guy's great big dick up your butt.
My advice if you are straight is to hang out with girls as much as you possibly can. If you are with guys, you do not know what will happen. It could be just checking out a guy's package at the mall. Next thing you know it is looking at a guy's dick in the showers, and then, bingo--black is white, up is down, in is out, a man is a woman.
I would not risk it.