Masturbating too quickly can cause Premature Ejaculation and/or it can make a man last longer
Masturbation before sexual intercourse, while partially effective in the short term, may ultimately exacerbate rather than alleviate Premature Ejaculation (PE), as men deliberately ignore or fade the sexual sensations that need to be controlled in order to improve the condition. Furthermore, bad masturbation practice, i.e. a non-stop rush to climax, can further impede the development of ejaculation control mechanisms.
Masturbation before sexual intercourse is one of the so called behavioural self-techniques and it’s used by many younger men. The reasons that support in theory this method are related to the fact that, following masturbation, the man could partially increases ejaculatory control, learning to recognise the signs of increased sexual arousal and how to keep his level of sexual excitement below the intensity that elicits the ejaculatory reflex. Moreover, the penis is desensitised resulting in greater ejaculatory delay after the recovery period.
However, the effectiveness of behavioural self-help techniques are not supported by controlled researches. Furthermore, clinical experience suggests that any improvements achieved with these techniques are generally not maintained long term.
References
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Corona G, Ricca V, Boddi V et al. J Sex Med 2010;7(1 Pt 1):182-191.
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Rowland DL, Strassberg DS, de Gouveia Brazao CA, Slob AK.J Psychosom Res 2000;48(1):69-77.
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Corty EW.J Sex Med 2008;5(11):2694-2702.
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Revicki V et al. Health and Quality of Life Outcomes 2008;6:33.