Things arouse me contrary to my orientation?

I'm straight (girls don't do anything for me, but guys with no shirts are HOT! know the old spice man? oh my god) but I enjoy watching gay porn. Not lesbian porn, that bores me, but gay anal porn. I also enjoy it very much when it hurts. I also like watching hentai rape porn. Same with bestiality porn (animals having sex with women). I feel so dirty and sick, cause I know it's wrong, especially to enjoy the pain and humiliation, and I know i would never do any of that stuff myself. i think i enjoy the subjection and the power control, and just one person "winning" and being in control, though I believe sex should be a communication of love and trust in real life. I also oppose porn on moral grounds (i think it degrades people, especially women). i fell so guilty and disgusting too. is this normal?