Orgasmic disorder (the absence of orgasm) is almost always the result of some psychological problem. However, this discomfort may also occur if a person is not sexual excited or if a person is impotent, which can be caused by some physical discomfort – e.g. damage to the nervous system due to injury or illness – or some medications (side effect).
Absence of orgasm is extremely rare in men; on the other hand, only 30% of women experience orgasm with only sex, i.e. without the stimulation of the clitoris, and about 10% of the women never experience orgasm (not even with masturbation), regardless of the circumstances.
If you are not happy about the frequency or ease with which your partner or you achieve orgasm, speak honestly to him/her about the problem. You may find that you should change the way you practice sex. A mutual stimulation of genitals may help, with fingers or tongue, before the actual intercourse. Vibrator may also help sometimes.
If the problem persists, go to the doctor. He may refer you to a specialist clinic, but probably won’t prescribe any medication – unless the cause of the disoroder is some other condition. A therapy at specialist clinics includes sessions at the clinic itself as well as exercises – for example, how to stimulate an orgasm with erotic imagination at the peak of sexual activity.