Whatever the reason, most porn actors in straight stuff aren’t that attractive, except for being well-endowed, and since most porn is geared towards men, that’s clearly what they want.

I can’t remember his name now but there is actually a male comedian who has a bit about this, pointing out to guys who swear they are hetero that they don’t want to see a little small, thin dick in porn. They do want to see the freakishly big guy, (as evidence by who is in most porn -Ron Jeremy was in a lot of movies past the point when he was actually attractive in any other way) perhaps because they’ve been so acculturated to that as being important for masculinity.