I do get the impression that it's more about the amount of sex you're having, rather than her past... It's nice that you make all the effort to see her, but it really doesn't mean that you're 'owed'. You obviously feel some resentment - you put in the effort and she doesn't 'put out'. I wonder exactly, how much sex you do want - every time you see her?

I once had an amazing boyfriend, he was funny, kind, gorgeous - oh, so so gorgeous and just the best bloke to be with. One big problem? He wanted sex, lots of it. Every time we met, or stayed over each other's house. Now this isn't a problem in itself, it was his attitude whenever I said no, which wasn't often. Hey, I do not want to have sex sometimes, its my choice. Sometimes I just want to hang out, have a giggle, go to dinner, go to a gig or whatever. I certainly do not want to hear how I am supposed to give him a blow-job if I do not want to have sex. I want to give those when I am feeling sexy, happy, valued. When I want for both of us to have a good time. If it's gratification he is after and cares nothing about my feelings, then he should've got a blow-up doll.

You know, instead of feeling wanted, flattered that he fancied me so much, I actually felt the opposite. I felt my feelings were not understood, that his own need was greater than my own, whereas they should be equal, and I felt undervalued. I started to withdraw, had sex less and less because frankly, it annoyed the hell out of me. We split up. I loved him very much, he loved sex more. All he had to do was not get annoyed on the occasion I didn't feel like it, so simple.

I hope you understand this.