So I'm pretty new to both OT and to sex, so for the purpose of my problem I'll share the limited experience I have. Girl 1 - We have sex, one time, nothing else. There's ~2 hours of penetration, and after her third time, she's getting tired, and pretty much asks to quit. I did not cum. Girl 2 - She gives me head a few times, nothing else. I have no problem cumming, and rather quickly at that, each time. Compared to Girl 1, I have very little interest in this girl, so I know that it's not that I simply "like her more" or anything like that.. Girl 3 - We had sex last night and this morning. Last night, a solid hour of penetration, and she's "starting to get dry." I didn't want to hurt her or make it uncomfortable, so I stop. I did not cum. We started to do it again this morning, and went at it for probably 15 minutes, in which time, again, I did not cum. I'm thinking that I simply cannot cum during sex. I can feel it more or less building up within my penis, it feels great and all, but just doesn't happen, no orgasm. I have no problem doing it on my own, and apparently have no problem when getting head. So what's up with that? It doesn't so much annoy me as it does simply hurt my feelings.. it makes me feel like less of a man and well.. simply hurts. Any ideas? Anyone else have this problem? CLIFFS: I cannot cum during intercourse. What can I do?