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"While it is generally accepted that prostate cancer is a hormone dependent cancer, apart from age and family history, its causes are poorly understood," he said. "If the ducts are flushed out, there may be less build up and damage to the cells that line them."

The research was conducted with men who were under the age of 70 when they were diagnosed with prostate cancer, and with a group of similarly aged healthy men. There were 1079 men with prostate cancer and 1259 healthy men in the study. The men, from around Australia, filled in a confidential questionnaire which sought details of their sexual activity at various times in their life.

...If the ducts are flushed out, there may be less build up and damage to the cells that line them."

You read between the lines ;-)