Well I would like to make this comment your girlfriend is really stupid for talking about your sex life and your kinks because it may make those girls very interested in you and she might end up without a boyfriend. She should be very careful what she says to her friends because sometimes when girls hear things they might like what they hear and then they might come and try to make you there's. You need to tell her she needs to think about that before she opens her mouth next time.Women tend to be very competitive and she could be making you very appealing to them. I also would tell her you don't appreciate her telling others about your kinks because it makes you uncomfortable and if she has any respect and love for you she would respect your feelings and boundaries.