I had one gf that had an incredibly tight box. and my over 6" girth was way bigger than anything she had experienced. lots of foreplay, to get her wet, and her on top, slowly working me in. it was painful at first, but after about 2 wks, I went in pretty quick relatively speaking, so I became a little freer and quicker in movement, and about 5 minutes in she had quite an orgasm, she got real slippery then, and I quickened the pace, and we both came together. after about a month, I would start on top, work about 1/2 way in, and she would grab my ass and shove the rest of me into her. she said sex and having orgasms with me compared to her old bf was like the difference in night and day. we broke up after 4 months, but it wasn't over sex. she said I ruined her because if her new bf didn't measure up, she lost interest right away. I got cussed out one night because of this, she was a little tipsy.