Premature ejaculation is a common sexual complaint. Many men occasionally ejaculate sooner during sexual intercourse than they or their partner would like. Estimates vary, but as many as one out of three men may be affected by this problem at some time. As long as it happens infrequently, it’s not cause for concern. However, if you regularly ejaculate sooner than you and your partner wish — such as before intercourse begins or shortly afterward — you may have a condition known as premature ejaculation.