One very sure means of contraception is vasectomy — a minor surgical operation that blocks the transfer of sperm from a man's testes to his urethra (and thus to his partner) by interrupting the tube leading from the testis. One concern has been that somehow this procedure might increase the risk of prostate cancer. But now a meta analysis has found that the risk is virtually non-existent.
A recent study from the Harvard School of Public Health suggests vasectomies are associated with an increased risk of advanced or lethal prostate cancer.