His and Her Health

I never really thought about it till I started looking online. My partner and I have been active for several months. Our sex lives are fine but we've noticed that the more passionate/intense it gets, she tends to get a strong cramping sensation.

Problem? Not the first time it's happened. My past relationships have had the same problems. I'm 22, 5'6. and for my whole life I've just assumed I was average. It wasn't till she mentioned that I'm...er...bigger that I looked into it. Do I risk damaging myself or her?

You may be hitting the opening of her cervix when you get more intense.Try some positions where she has more control of how deep you stroke.You won't damage yourself but the cramping may turn her off of enjoying sex.

That's another part of the issue. She's very submissive, and hates being in control [I don't mean that figuratively, any positions where a woman is typically in control she gets turned off and can't function sexually], Are there any suggested positions?