Ejaculation frequency and prostate cancer
Contrary to some case study research, a new epidemiological study showed no correlation with ejaculation frequency and increased risk of prostate cancer, in fact quite the opposite is suggested. So for all you orgasmic wunderhands, now you have some justifications.
JAMA. 2004 Apr 7;291(13):1578-86. Related Articles, Links
Ejaculation frequency and subsequent risk of prostate cancer.
Leitzmann MF, Platz EA, Stampfer MJ, Willett WC, Giovannucci E.
Division of Cancer Epidemiology and Genetics, National Cancer Institute, National Institutes of Health, Department of Health and Human Services, Bethesda, Md 20892, USA. email@example.com
CONTEXT: Sexual activity has been hypothesized to play a role in the development of prostate cancer, but epidemiological data are virtually limited to case-control studies, which may be prone to bias because recall among individuals with prostate cancer could be distorted as a consequence of prostate malignancy or ongoing therapy. OBJECTIVE: To examine the association between ejaculation frequency, which includes sexual intercourse, nocturnal emission, and masturbation and risk of prostate cancer. DESIGN, SETTING, AND PARTIC(KP)ANTS: Prospective study using follow-up data from the Health Professionals Follow-up Study (February 1, 1992, through January 31, 2000) of 29 342 US men aged 46 to 81 years, who provided information on history of ejaculation frequency on a self-administered questionnaire in 1992 and responded to follow-up questionnaires every 2 years to 2000. Ejaculation frequency was assessed by asking partic(KP)ants to report the average number of ejaculations they had per month during the ages of 20 to 29 years, 40 to 49 years, and during the past year (1991). MAIN OUTCOME MEASURE: Incidence of total prostate cancer. RESULTS: During 222 426 person-years of follow-up, there were 1449 new cases of total prostate cancer, 953 organ-confined cases, and 147 advanced cases of prostate cancer. Most categories of ejaculation frequency were unrelated to risk of prostate cancer. However, high ejaculation frequency was related to decreased risk of total prostate cancer. The multivariate relative risks for men reporting 21 or more ejaculations per month compared with men reporting 4 to 7 ejaculations per month at ages 20 to 29 years were 0.89 (95% confidence interval [CI], 0.73-1.10); ages 40 to 49 years, 0.68 (95% CI, 0.53-0.86); previous year, 0.49 (95% CI, 0.27-0.88); and averaged across a lifetime, 0.67 (95% CI, 0.51-0.89). Similar associations were observed for organ-confined prostate cancer. Ejaculation frequency was not statistically significantly associated with risk of advanced prostate cancer. CONCLUSIONS: Our results suggest that ejaculation frequency is not related to increased risk of prostate cancer.
Certainly ageing makes one more prone to development of prostate cancer, likely from decades of accumulated genetic defects and exposure to growth factors. But older men (I can attest to this) just don't seem to ejaculate (or have intercourse) as often as younger men. I wonder if this is a factor at all in the age association with cancer?
looking at the study, it seems there is a very low associationone way or the other. I think the major point of the study was to dispell the notion the higher ejaculation frequency is correlated to increased levels of prostate cancer.
anecdotally, i guess i will be OK since my orgasm rate is rate up there with the younger wh(KP)persnappers!