The opposite happened to me: When I was younger (up to maybe 19 or 20) I found the sensation of ejaculating inside a partner SO intense that I was a bit frightened by it and could often have sex for an hour or more without reaching orgasm. So I never came during my first time having sex, although we were probably going at it for at least 30-45 minutes.

I still have very powerful orgasms today, but am not so intimidated by it anymore. :happy:

Steve