Girlfriends ex

Been with my girlfriend for a little while now. Recently we haven't been able to have sex in the house because to many people are there currently so we went to the store one day and decided to pull off somewhere and go at it. She seemed to be really into it and seemed to enjoy it just a bit more than usual. (We don't have a boring sex life we do many different things and explore lots of avenues) this happens to be the first time we did it this way, but when we first started dating we talked about our past sex lives and she mentioned that her and her ex had sex in a vehicle and out in public where being caught was a possibility (just like we did) anyways I'm thinking she might have been thinking about her ex. I don't know though. She did tell me that with her ex it was always the same ole positions just missionary or her on top. Pretty boring stuff and with me she does many different things it's more interesting sex. (It took a while to get us to where we are because she wasn't sure about trying new things). To get to the point I want to ask if that's what she was thinking about. When we had sex in public. This never crossed my mind before on any other occasion but for some reason it did this time. Should I ask about this or just go with the fact that she enjoyed it and I enjoyed it and leave it alone. via /r/relationship_advice http://ift.tt/2rKu4D7