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Alfred Kinsey

For boys who become adolescent by 11 years of age, masturbation provides the first ejaculation in nearly three-quarters of the cases (71.6 per cent); but for the boys who become adolescent last, masturbation is the source of the first outlet in only about half of the cases (52.1 per cent). Nocturnal dreams, on the contrary, are the first source for only 21.6 per cent of the younger adolescent boys, but for 37.1 per cent of the late-adolescent males.