Classification of premature ejaculation 1. Shapiro (1943) Type A: Premature ejaculation with penile erectile dysfunction, mostly seen in the elderly. Type B: Premature ejaculation is not accompanied by libido and penile erectile dysfunction, mostly seen in young people. 2. Cooper (1969) Type I: primary premature ejaculation occurring after puberty, not accompanied by erectile dysfunction, and premature ejaculation associated with psychological uneasiness. Type II: Premature ejaculation that occurs suddenly but is accompanied by erectile dysfunction and is related to psychosexual restlessness. Type III: Premature ejaculation that is not obviously related to psychological uneasiness but is accompanied by hypoactive sexual desire and erectile dysfunction, and premature ejaculation occurs gradually and progresses. 3. Godpodinoff (1989) Primary premature ejaculation: It refers to the occurrence of premature ejaculation from the beginning of the first sexual intercourse. Secondary premature ejaculation: It refers to premature ejaculation that occurs gradually after having had normal ejaculation in the vagina in the past. In addition, there is situational premature ejaculation: premature ejaculation occurs from person to person, time to time, and place to place.