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.
by somerandomdouche June 14, 2009