Well, ever since I was 11 I've been (without knowing until I was a couple years older) doing kegels (i'm 20 now). Like, so often that I just do them whenever I'm sitting at the computer or in the car or anything and I can do them for hours without stopping. Well, apparently, despite all the sex I've had, my boyfriend complains that I've never loosened up, not once, and that even though it feels great he doesn't get a lot of stamina in because I have a great deal of orgasms before he does and every time I do I end up clenching and he says its impossible for him to go without cumming (with me) for more than 20 minutes. He thinks its because I inadvertently do kegels all day long and that the muscles are too strong? Is that possible? Also, sometimes I'll be messing around afterwards when he is still inside me and I'll flex so hard he gets stuck! And then other times I flex the muscles a different way and I can push him out. Are these two different groups of muscles? And can all women do this? Because he says that he's never met anyone that can push him out with just their vaginal muscles.