I am just curious...my boyfriend is not huge by some standards, but in my experience he is bigger than I am used to. I am guessing 7 inches or so. When we first had sex, it was painful and for the most part that has gotten better. I have an IUD, so do not use hormonal birth control. I have noticed that sex is most painful during my fertile time - right after my period to the middle of my cycle. I have to let my boyfriend know so he can pull back a little bit. When I'm closer to the end of my cycle, it doesn't hurt at all. I do know your cervix moves during your cycle, and I am guessing this is what is happening. I was just curious if other women have noticed this. I guess there's not a whole lot for me to do, aside from what I already do which is to tell him to take it easy!