I mean he should know right?! I figure the same way any couple who blends their social circles together, are going to find out things from their partner that they never knew: “wait, she didn’t tell you about the scenes …my bad I thought you knew!”
I also think the question is more about how or when he found out. I see that they both from South Florida, if your under the age of 80 in that region - you know what BangBros is even if you don’t watch it. So there may be a chance he saw the video before they met if that’s the case. Let’s face, it girls deal with the past a lot better then guys so she might have ripped that band-aid when things started to get serious and told him some watered down version of her porn experience. Also guys love to bust each other’s balls so I know if that were my boy getting married to “Larem” I would have definitely had some inside jokes at the wedding: “you think JMac is going to walk her down the isle!?” - so if he has a friend at all, odd are they stumbled on the video as well.