I have to agree with Thumper (#40) there is little evidence to suggest that reduced ejaculation causes prostate cancer. There have been TWO studies that have found a relation between number ejaculations in earlier periods of life and risk of prostate cancer. Compared to men who ejaculated less frequently, men who ejaculated more frequently, i.e., (~4-7 times per week) were ~33% less likely to be diagnosed with prostate cancer. One study was in Australian men and the other was in the Health Professionals Follow-up study (non-physicians but health professionals) so not exactly generalizable to the U.S. population. These findings constitute the sole evidence for a link between ejaculation frequency and prostate cancer risk.

In other words, not such a lot of evidence. Finally, even if there WERE a relationship, CORRELATION IS NOT CAUSATION. In other words, just because you see a connection, doesn't mean one thing causes the other (e.g., carrying a lighter around doesn't cause lung cancer but you can bet that people who do have a higher risk of lung cance