So you've met what seems to be the love of your life. She's beautiful, kind, intelligent, has a promising future... all of that you've ever dreamt about a woman. One day you realize how much of a lucky man you are, so you decide to take her to a special date. You go out, drink some alcohol, have fun, go back home, drink even more alcohol, and you two get fucking drunk. In the small talks her past comes to the conversation, she starts talking about some guys she dated before you and she mentions that she participated in some heavy shit, like gangbangs, orgies, just one month or so before you've met.
CAN YOU LIVE WITH THAT? is her past dead? or you'll just pick up your stuff and get the hell out of there? (note that in this scenario she IS exactly who you think she is, never cheated on you or anything, is just these things with her past).
If that gets your juices flowing, sure. I've never watched a porno with my fiancee but I've been informed some like that. If you want you can always offer your insight into her tecnique, she might appreciate the pointers the next time she ends up in a gangbang.