That's the thing, I also look away when two men kiss (not a massive lesbian kissing fan, but it doesn't have the same affect; I assume, because I'm male) as it makes me gag. Is that what homophobia is? If so, I'd say that I'm probably homophobic. I'm not intolerant of the person, just the act. What seems natural to some, clearly isn't to others. I'm repulsed by something that isn't natural to me. I believe that my reaction is as close to a natural reaction (i.e. free from any outside influence) as is possible, although I have made no effort to see if I can overcome it by watching gay soap scenes on a loop.
What I don't understand, or struggle to understand, is if it's the same in reverse? Does a gay man watch a straight couple kissing on Emmerdale Farm and get repulsed by it? Or is it far more complex? I'm assuming what is as natural to me (trappin birds) is equivalently natural to gay people (trappin ither gays). In order to understand it, inotherwords, you have to be gay. It is probably, then, that neither are "unnatural" at all, just different things to different people.