Well no they don't, not all of them.
My dad for example or my father in law. I mean I don't know for sure but for various reasons it's pretty unlikely.
I also think that most mainstream porn these days is pretty grim and some men just wouldn't like it- mainstream het porn is about sexual dominance over women. Not all men are into that and the other way round is pretty niche and would require hunting...
Most people under a certain age have seen porn I think. Whether all men watch it- s majority? It's there it's free and it's what they are 'supposed' to do- it's normalised.
I often wonder when the incident happened that human males in the UK sadly lost their imaginations. Because a lot of people seem to think without porn there's no wanking which is flat out weird.
OP though you haven't really mentioned porn.
You talked about different things.
'No real back story but have reason to believe that my bf does now and again ... mainly through presumption of women he follows on Facebook ... first six pictures etc.'
I don't go on Facebook much but if you're friends can't you see everyone he's friends with etc? Is it different to following? If the first 6 people on the screen (not sure which screen) are all scantily clad young women then who knows what's going on. Facebook isn't porn like I think of it. I don't know how far things can go on Facebook etc. If I was going to watch porn I'd watch porn. Following hot young people on Facebook is a bit different surely?
'I know he also games with many men and women throughout the world through that platform so he has many' friends' from that..
He doesn't like or comment on the women's posts but they show up now and again on the six profile pics of his friends on Facebook .'
What does this have to do with porn? These are women who he knows through gaming, he also knows men through gaming. How do you mean they show up on his friend's profile pics. Are these real life friends? I'm not at all sure what you're getting at here.
If you have some more info you might get more pertinent responses.