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What it really all boils down to is personal preference. A person's porn preference doesn't really have anything to do with their sexual preference. Some people really don't care, so long as the gender they're attracted to is present in the porn. Some don't want the same gender in their porn at all, some don't mind it.
It's not a function of being straight, or gay. It's a function of what arouses the person viewing the porn. So saying straight porn would "do it better" for straight people is kind of senseless. Granted, the straight person would make sure that it's the opposite sex in the porn, that's what they prefer. But I don't think it would be fair to assume that porn in any form cannot be enjoyed by an audience it wasn't intended for.