Premature ejaculation occurs when a man ejaculates sooner during sexual intercourse than he or his partner would like. Premature ejaculation is a common sexual complaint. Estimates vary, but as many as 1 out of 3 men say they experience this problem at some time.As long as it happens infrequently, it's not cause for concern. However, you might be diagnosed with premature ejaculation if you: 1. Always or nearly always ejaculate within one minute of penetration 2. Are unable to delay ejaculation...