As is true in rapid ejaculation, that timeframe can vary and be different for the partner. Delayed ejaculation is the inability of a man to achieve climax within a reasonable amount of time. This can be as, if not more, frustrating than its opposite. The opposite of premature or rapid ejaculation is delayed ejaculation. The Men’s Clinic at UCLA - Delayed Ejaculation: Overview What is Delayed Ejaculation?