Male orgasmic disorder may be defined as a persistent or recurrent inability to achieve orgasm despite lengthy sexual contact or while participating in sexual intercourse.
The mental health professional's handbook, the Diagnostic and Statistical Manual of Mental Disorders(DSM-IV-TR), includes this disorder among the sexual dysfunctions, along with premature ejaculation, dyspareunia, and others.
The individual affected by male orgasmic disorder is unable to experience an orgasm following a normal sexual excitement phase. The affected man may regularly experience delays in orgasm, or may be unable to experience orgasm altogether.
First, it is important to this discussion to understand the characteristics of a "normal" orgasm. The sensation of orgasm in the male includes emission followed by ejaculation. The term emission refers to a sensation of impending ejaculation produced by contractions of the prostate gland, seminal vesicles, and urethra accompanied by generalized muscular tension, perineal contractions, and involuntary pelvic thrusting. Orgasm is followed by a period of resolution characterized by feelings of well-being and generalized muscular relaxation. During this phase, men may be unable to respond to further sexual stimulation, erection, and orgasm for a variable period of time.
It is also important to distinguish orgasm from ejaculation, although in most instances they occur almost simultaneously. Orgasm is a peak emotional and physical experience, whereas ejaculation is simply a reflex action occurring at the lower portion of the spinal cord and resulting in ejection of semen. Some men have been able to recognize the separation of the two processes, enabling them to experience multiple orgasms without the occurrence of ejaculation. Once ejaculation takes place, a period of recovery time is required prior to a subsequent orgasm.
The sensation of orgasm differs between individuals, and individual orgasms may differ in the same person. All orgasms share certain characteristics in common including rhythmic body and pelvic contractions, elevation of the heart rate, systemic hypertension, hyperventilation, and muscle tension, followed by the sudden release of tension.
Ralph Myerson M.D., The Gale Group Inc., Gale, Detroit,