guys...how old were you the first time your partner had an orgasm with you in there? did you feel her coming and did it make you come at the same time?
Are you talking about contractions? I've felt it quite a few times. I also had one girlfriend (she was 23, had had 3 sexual partners beforehand, and I was a virgin at age 19) who was a squirter. That was fun... I could probably count in one or two hands the times in which me and my sexual partner orgasmed simultaneously. It usually takes me an abnormally great amount of time to come, and women who are orgasmic (or who have become orgasmic with me, as was the case with my first girlfriend mentioned above) usually climax before I do.