During sex, I maintain an erection, but it takes what my ex-girlfriend said is an inordinately long amount of time for me to ejaculate, on the order of an hour of actual sex. I'm not sure if this is a medical issue or something, but she (my girlfriend) says it's weird. It's at the point where she had to take breaks during sex, and she was getting frustrated with the whole deal. It doesn't seem to matter how aroused I am, or what we're doing, as there was no difference between how long it takes with oral or vaginal sex, and it took longer if she was just using her hand. Is this something I should talk to a doctor about, or...?
More info: I still took that long with previous girlfriends, she was just the only one who said it was abnormal, and I'm not sure if it even is or not.