An alternative form of erotic denial is the total denial of all genital stimulation. To ensure a total denial of stimulation a couple may use a chastity belt or other device that physically prevents touch and/or (for males) full erection.
Different studies have found that masturbation is frequent in humans. Alfred Kinsey's studies have shown that 92% of men and 62% of women have masturbated during their lifespan. Similar results have been found in British national probability survey. It was found that 95% of men and 71% of women masturbated at some point in their lives. 73% of men and 37% of women reported masturbating in the four weeks before their interview, while 53% of men and 18% of women reported masturbating in previous seven days.
It is widely believed that abstaining from orgasm via masturbation or sexual activities will induce a sleeping orgasm, however the frequency that one has nocturnal emissions has not been conclusively linked to one's frequency of masturbation. Widely-known sex researcher Alfred Kinsey found "There may be some correlation between the frequencies of masturbation and the frequencies of nocturnal dreams. In general the males who have the highest frequencies of nocturnal emissions may have somewhat lower rates of masturbation. Some of these males credit the frequent emissions to the fact that they do not masturbate; but it is just as likely that the reverse relationship is true, namely, that they do not masturbate because they have frequent emissions. For women the correlation is also short of conclusive; "According to Kinsey's findings, women who suddenly lost the opportunity for several coital orgasms per week had only a few more orgasms in their sleep per year.
Subjects can be kept in denial indefinitely (periods around 2 to 4 weeks each time are often quoted as being safe subject to proper skincare and regular checking). Many, however, suggest that this is very subjective, and often informally suggest a shorter period such as 3 days or a week between release instead — especially when starting.
Beyond that, the long term consequences for denial are unclear, although there are negative effects implied by a recent Australian study, which found that frequent masturbation may help prevent prostate cancer in men.
Most sources seem to agree that the body will spontaneously reabsorb sperm, but that the prostate fluids should be removed fully and regularly, if not through orgasm then via internal prostatic massage (known as "prostatic milking") to reduce the risk of prostate cancer and inflammation, muscular atrophy, (orgasm involves the prostate muscles) or tissue damage to the prostate. It is also said that if erection is inhibited for long periods the skin of the penis becomes less elastic which may cause pain or other difficulty in the future.
Normally, during sexual arousal, ejaculatory fluid accumulates in the male accessory sex glands - the seminal vesicles, the prostate, and the bulbourethral glands (or Cowper's gland) - backing up behind valves in the ejaculatory ducts. When fluid pressure reaches a high enough threshold, the valves open and the urethral bulb fills, triggering the ejaculatory reflex and muscular contractions of orgasm, which empties the glands.
Without orgasm, prostate milking may be used to help to flush out the build up of toxins which accumulate within the prostate gland. This can be done by allowing ejaculation without orgasm. As most men need penile stimulation to reach the latter, this milking can be done without risk of orgasm.
Milking involves massage of the prostate, during which fluid will be secreted with a pleasurable sensation somewhat like slow urination. After continued massage, the fluid will flow out freely. Once a sufficient amount of ejaculatory fluid has drained, insufficient fluid pressure to trigger the ejaculatory reflex will remain, and no amount of penile stimulation will result in orgasm until the fluid glands are recharged. This may take several hours to several days. Milking can thus be used to prevent orgasm and nocturnal emissions if applied at appropriately timed intervals.
Orgasm denial practices can allow dominant males and females to exercise control and training over a highly intimate and psychologically significant part of their partners' lives. This can extend to tolerance of increased stimulation, and training both to hold back orgasm, or to orgasm on command. This technique gives the dominant partner enjoyable feelings of control and power.