It can work however! There aren't strict guidelines for what sex is supposed to be like. There doesn't even need to be penetration involved and it can still be a good time.
The pic implies an FFFM foursome with the trio of women behind the couch topping/domming and the guy on the couch bottoming/subbing. I don't think it specifically implies penetration.
i forgot strapons existed and i think that would enable a greater variety of double/triple/whatever penetration videos than gay porn currently does.
based on the strapon usage i've seen: i suspect people who use strapons derive more psychological pleasure than physical pleasure and if that would have an impact on the quality of the porn.