<unk>  is a prevalent sexual dysfunction in men; however, because of the variability in time required to ejaculate and in partners' desired duration of sex, exact prevalence rates of<unk>  are difficult to determine. In the "Sex in America" surveys (1999 and 2008), University of Chicago researchers found that between adolescence and age 59, approximately 30% of men reported having experienced<unk>  at least once during the previous 12 months, whereas about 10<unk> rcent reported erectile dysfunction (ED). Although ED is men's most prevalent sex problem after age 60, and may be more prevalent than<unk>  overall according to some estimates,<unk>  remains a significant issue that, according to the survey, affects 28<unk> rcent of men age 65–74, and 22<unk> rcent of men age 75–85. Other studies report<unk>  prevalence ranging from 3<unk> rcent to 41<unk> rcent of men over 18, but the great majority estimate a prevalence of 20 to 30<unk> rcent—making<unk>  a very common sex problem. There is a common misconception that younger men are more likely to suffer<unk>  and that its frequency decreases with age. Prevalence studies have indicated, however, that rates of<unk>  are constant across age groups.
Premature ejaculation
Delayed ejaculation
Dyschronometria
Retrograde ejaculation
Dyspareunia
Pelvic floor dysfunction
Persistent genital arousal disorder
Coital incontinence