The frequency of nocturnal emissions is highly variable. Some men have experienced large numbers of nocturnal emissions as teenagers, while others have never experienced one. 84% of men in the United States will experience nocturnal emissions at some time in their life.[2] For males who have experienced nocturnal emissions the mean frequency ranges from 0.36 times per week (about once every three weeks) for single 15-year-old males to 0.18 times per week (about once every five-and-a-half weeks) for 40-year-old single males. For married males the mean ranges from 0.23 times per week (about once per month) for 19-year-old married males to 0.15 times per week (about once every two months) for 50-year-old married males.[3] In some parts of the world nocturnal emissions are more common. For example in Indonesia surveys show that 97% of men experience nocturnal emissions by the age of 24
Some men have the dreams only at a certain age, while others have them throughout their lives following puberty. The frequency that one has nocturnal emissions has not been conclusively linked to frequency of masturbation. 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.
