You have to communicate openly and honestly. That’s the only way a relationship is going to work anyway. My girlfriend was into group stuff and occasionally sleeping with girls before we were together. I’m not into it, so she respects that boundary. I was really into eating ass before I met her, Read more… she’s not into it, so I respect her boundary. We still have the best sex each other has ever had because we establish trust and open and honest communication. We watch porn together sometimes, and we both experimented with some BDSM stuff recently and it had never worked for me in the past, but we both really enjoy it.
Bottom line, talk to her, don’t show her porn. Real life sex is absolutely nothing like that.