I see you're new, so welcome to PC.
It's true; our sexuality is complicated. All kinds of stuff turns me on that I have never admitted out loud because I know it would disturb people, and lots of stuff confuses me about my sexuality as well, when I think about it. The way I've heard it explained is, we get so caught up in the 'right' and 'wrong' of it and forget that they are just harmless thoughts/fantasies. If you're wondering if that has anything to do with your sexuality, or wonder why you are being turned on by one type of person with a penis when you have no sexual interest in men, of course you can wonder but the bottom line is, if you find it sexy, if it's not hurting anyone, then you're fine. We get so hung up on sexuality all the time that we forget it is a normal part of our chemistry. What turns us on turns us on. It's really difficult to help that.