Intravaginal ejaculation latency time (IELT) is the time taken by a man to ejaculate during vaginal penetration. IELT varies not only from man to man, but from one time to the next for the same man and tends to decrease with age.Some medications such as selective serotonin reuptake inhibitors (SSRIs) have an impact on IELT. IELT is one factor used to diagnose and treat conditions such as premature ejaculation.