You are telling me that that guy with a dick up his ass is not gay? How about the guy with the dick down his throat? Not gay? How can that be? I just don't get it at all. I think this is the biggest revelation of my life. Str8 guys doing gay porn. Oh my!
Well, first keep in mind that labels are awfully simplistic things to use. If, say, a guy had sex with a man once very few years if he is really, really, horny, but has sex with dozens of women a year. You could argue that he isn't "straight", but it would be very misleading to call him "bi", wouldn't it?
Is sexual orientation about your sexual history, or about what turns you on? Can you be gay if you are a virgin? Are you gay if you have a "dick up your ass" because you are being raped? Is a Hollywood actor who can act everything from tender romance to hard action scenes gay if he kisses another man as part of filming?
If a guy has no interest in having sex with men, never does so recreationally, abstains from sex for two weeks and pops a Viagra
before fucking a guy for a paycheck "bi"?
Some men are capable of physically performing sex with anyone. Some men are capable of enjoying sex with someone they are not attracted to. Some men are able to enjoy sex with other men, but don't really desire to. This whole sex thing is complicated.
As a trivial example, last month I was flogged by a woman. I am able to enjoy flogging from women, though that sort of thing is about the limit of what I will do sexually with a woman. I'm pretty damn sure I'm not bi.
Porn is about acting and crafting a product that is more fantasy than reality. To me the bigger question isn't, "how can a straight guy do gay porn?", but rather "how can any guy perform, much less have fun, under those conditions?"
Having a director re-position you every few minutes for a different angle etc. must be a real mood killer sometimes. I can I just imagine the reaction if someone's cell phone goes off just as you are about to deliver your cum-shot!
You: "Oh yeah, I'm cumming, I'm cumming, oh god..."
{insert Lady Gaga ring tune here}
You: "I'm cum.... oh"
{dribble, dribble - totally boring orgasm}
Director: "Get that fucking phone off my set! Ok, guys we need another take on that cum shot, get hard again."
Honestly, I admire anyone who can do this.