I think there are a coupe of things missing in the comments I've read: first of all, this may not simply be a phase.
I am a bit older and still prefer gay porn (goes in phases). I am HAPPILY married and would never be in a relationship with a man. I have no attraction towards men in an ”intimate” way at all. However porn and masturbation is very different from sex and intimacy. It's more primal and fantasy is involved.
I too am not into watching men kiss, and definitely not anal, but do find it very erotic watching males masturbate, ha****b, etc. There are 2 main reasons for this being completely normal: first, all males masturbate themselves, and it is always our first sexual experience of pleasure (self discovery if you will). It is also natural for young boys/teens to experiment with their male friends. Consequently, it makes perfect sense that watching male genitals would be arousing! it is basically hard wired for us. We associate or own genitals with pleasure during masturbation, therefore we associate, male genitals with pleasure. In fact, you'll find that in your encounters with women, that many females are not so wildly attracted to penises. But they are turned on by men, male sexuality, and they idea of sex and intimacy with a man. I think men are the same way about women to a degree but don't really talk about it. For example, on the surface, vaginas are kind of strange/unattractive and definately intimidating when you are inexperienced :), but I love them. I love giving pleasure to a woman, and being intimate. This is the diifference between fantasy and reality, erotica and lifestyle. Secondly, human sexuality is not completely black and white many things are quite ”normal” in western culture, this is a negative thing to talk about and it shouldn't be. We are so scared of not being seen as masculine. It's pretty dumb actually! as young men you are obssesed with how you are perceived and it is seen as a nagative to be attracted to males.