Terapias de los sentidos: Sexo a tope...pero con mujeres.

Quick, count up your sexual partners — it's for your health. 

Men who have had sex with more than 20 women have a 28% lower chance of being diagnosed with prostate cancer, say researchers from the University of Montreal and Institut Armand-Frappier. 

But having more than 20 male partners doubles one's prostate cancer risk, the researchers added, as does never having sex. 

"It is possible that having many female sexual partners results in a higher frequency of ejaculations, whose protective effect against prostate cancer has been previously observed in cohort studies," said study leader Marie-Elise Parent of the University of Montreal. 

Ejaculating often is thought to lower the number of carcinogens in semen, one theory states. 

Men who had more than 20 partners were also 19% less likely to get a more aggressive type of prostate cancer, Parent and her colleagues found in their study of 3,208 men. 

But having more than 20 male partners upped one's risk of a less aggressive prostate cancer by 500%, and the authors say it may be due to more exposure to STIs and the prostate being harmed by anal sex. 

The results, published in the journal Cancer Epidemiology, also found that men with prostate cancer were twice as likely to have a relative with cancer. (Ver)

 
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On the other hand, those who have slept with more than 20 men are twice as likely to be diagnosed with prostate cancer of all types compared to those who have never slept with a man. 

And their risk of having a less aggressive prostate cancer increases by 500% compared to those who have had only one male partner. Parent and her team can only formulate "highly speculative" hypotheses to explain this association. "It could come from greater exposure to STIs, or it could be that anal intercourse produces physical trauma to the prostate," Parent said. (Más)

Y...además:

El sexo te hace más inteligente, según un estudio