Is it normal that this gets me off?

Once, my friend dared me to watch 2 Girls 1 Cup and I nearly threw up because it was so gross. But then I watched it again a while later just for laughs and it sort of turned me on. But I think poop is disgusting, those girls have no morals, and I would never in a million years do something like that. It's a disgusting video. I mean, it turns me on to the point that I start masturbating to it but then when I'm done I just feel disgusting, I really think the video is repulsive, you know? Yet it still turns me on. I think it might be because it's regarded as so repulsive, so disgusting, so horrifying that the fact that I do that and would be considered a nutcase is what gets me going. Sort of like people who do it in public bathrooms or even in a church. Another example of this that might repulse you less is the idea of hooking up with another man. I'm in a relationship but having sex with another man really turns me on, even though I will always be faithful and would never sink so low as to cheat (especially just for cheap thrills).
Is this ordeal normal? Or am I a freak of nature?