I think its just one of those things that if you feel you need to tell someone, then tell them. But if they ask, be honest about it...otherwise they'll wonder what else you're not honest about. I told my girl about the number of partners and some of the "roman" type of activities we used to do. I felt that she needed to know that information. She told me her past and that was that. I felt a bit akward because I had been with five times the number of people she had but hey that's life. She didn't care and seems to appreciate some of the lessons I learned.