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Nocturnal emission
A nocturnal emission or wet dream is a spontaneous orgasm during sleep that includes ejaculation for a male, or vaginal wetness or an orgasm (or both) for a female. Nocturnal emissions are most common during adolescence and early young adult years, but they may happen any time after puberty. It is possible for men to wake up during a wet dream or simply to sleep through it, but for women, some researchers have added the requirement that she should also awaken during the orgasm and perceive that the orgasm happened before it counts as a wet dream. Vaginal lubrication alone does not mean that the female had an orgasm.
==Composition==
Due to the difficulty in collecting ejaculate produced during nocturnal emissions, relatively few studies have examined its composition. In the largest study, which included nocturnal emission samples from 10 men with idiopathic anejaculation, the semen concentration was equivalent to samples obtained from the same men by penile vibratory stimulation, although the percentage of sperm which were mobile and which were of normal morphology were higher in the nocturnal emission specimens.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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