Sometimes when i have sex with my girlfriend i ejaculate too fast. how can i prevent this from happening again, i hate it when it happens. Premature ejaculation (PE) means coming too quickly, and it's one of the most common male sexual problems. How common is premature ejaculation? We found that it's commoner in younger men – which is not surprising, . to gain more control over his responses and his urge to ejaculate quickly.