My wife is petite and was always very tight. She has a tilted cervix and wasn't supposed to be able to handle deep penetration (so I was perfect guy for her). When I first introduced a bbc dildo, I went very slow and assumed she wouldn't fit it inside. After 3 month she took all 8in. We have since moved up to the Sean Michaels Dong which is over 9 1/2 insertable and thicker. She is taking it all. Has crazy orgasms too. She was having cramps though so she went to the doctor. She thought that the toy ways causing the problem. It turned out it was something else. I did do some research when this was going on. I learned that when excited a womans cervix retreats and can open during deep penetration. When it does fluid can come out and sometime women can have cramps afterwards. She hasn't had any more problems since seeing the dr. and she takes her big bbc every time we fool around.