I am completely and utterly 100% straight. I love getting off to sex with my guy. But when I do masturbate I tend to look at porn of women stripping, specifically breast play. I don't know what that turns me on, I have no interest if being with a woman. Why is this?

Could I ask what age you are please.

Because it is what you like, why do some people like bacon and others don't, we each are different and life would be boring if we were not.

So you are straight, get then don't have sex with other women.