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A 2008 study concluded that frequent masturbation, at a rate of about two to seven times a week, between the ages of 20 and 40, is correlated with higher risk of developing prostate cancer. On the other hand, masturbation at a rate of once per week, in one's 50s, was found to be correlated with a lower such risk.[40]
:Selon Graham Giles, du Centre d'épidémiologie du Cancer de Melbourne en Australie: «Plus vous rincez les canaux, moins les liquides endommageant les cellules risquent de s'accrocher ».
Ejaculation frequency and subsequent risk of prostate cancer
.Leitzmann MF, Platz EA, Stampfer MJ, Willett WC, Giovannucci E.
JAMA. 2004 Apr 7;291(13):1578-86
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:CONCLUSIONS: Our results suggest that ejaculation frequency is not related to increased risk of prostate cancer
A case-control study of prostatic cancer in Kyoto, Japan: sexual risk factors.
Oishi K, Okada K, Yoshida O, Yamabe H, Ohno Y, Hayes RB, Schroeder FH, Boyle P.
Prostate. 1990;17(4):269-79.
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Marital status, fertility, ejaculation, masturbation, nocturnal emission, contraceptive use, and wife's episodes of sexually transmitted disease were not linked to prostatic cancer risk
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The Independent has reported that “masturbation can be good for the over-50s” claiming it may remove toxins and reduce the risk of prostate cancer. The Sun reported that “solo sex” during one’s younger life might increase the risk of prostate cancer
Sexual activity and prostate cancer risk in men diagnosed at a younger age.
University of Nottingham Medical School, Queens Medical Centre, Nottingham, UK. pd317@medschl.cam.ac.uk
BJU Int. 2009 Jan;103(2):178-85. Epub 2008 Nov 10
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:OBJECTIVE: To examine, in a case-control study, the association between the frequency of sexual activity (intercourse, masturbation, overall) and prostate cancer risk in younger men diagnosed at < or = 60 years old. PATIENTS, SUBJECTS AND METHODS: In all, 431 prostate cancer cases and 409 controls participated and provided information on their sexual activity. In particular, the frequencies of intercourse and masturbation during the participants' different age decades (20s, 30s, 40s, 50s) were collected. RESULTS: Whereas frequent overall sexual activity in younger life (20s) increased the disease risk, it appeared to be protective against the disease when older (50s). Alone, frequent masturbation activity was a marker for increased risk in the 20s and 30s but appeared to be associated with a decreased risk in the 50s, while intercourse activity alone was not associated with the disease. CONCLUSION: These findings could imply different mechanisms by which sexual activity is involved in the aetiology of prostate cancer at different ages. Alternatively, there is a possibility of reverse causation in explaining part of the protective effect seen for men in their 50s