The carotenoid lycopene appears to help prevent prostate cancer. Other foods under investigation are soy protein and green tea. Soy and green tea are basic to most Asian diets, though no one yet knows if they are responsible for the lower rates of prostate cancer in Asia. Some questions we can answer Smoking does not seem to increase the risk of prostate cancer. Vasectomy, in spite of some scary media reports a few years ago, does not increase the risk of prostate cancer.
Alcohol consumption seems to have no effect.
But sexual behavior is unrelated to prostate cancer so far as anyone can discover. Early detection may save lives, but PSA testing remains controversial as a screening method for all men. If you are under 50 and symptom-free, you need not be tested. If you are between 50 and 75 and prostate cancer runs in your family, or if you are African-American, you should be tested. Some doctors recommend that African-American men start testing at age 40.