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Just before a male ejaculates, there are premonitory sensations marking a point of no return—when ejaculation becomes inevitable. Some therapists call this the “moment of inevitability.” Once that threshold has passed, it is too late to delay ejaculation; it then occurs beyond the man’s control.
Masturbation helps men learn to recognize the "moment of inevitability" just before orgasm and helps teach them how to avoid premature ejaculation.
somerandomdoucheによって 2009年06月14日(日)
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Words related to Moment of Inevitability:

male masturbation orgasm semen sperm