You have a "green light" for sexual activity. While high levels of testosterone appear to promote the growth and spread of prostate cancer, there's no evidence that sexual activity or sexual stimulation can increase testosterone levels. It's also true that testosterone-blocking drugs used to treat prostate cancer can decrease a man's sex drive, but a man taking one of these drugs who maintains an active sex life shouldn't worry that he is interfering with his treatment.
What about taking testosterone supplements to increase sexual drive? This issue is a little more controversial. Giving a man extra testosterone might "fuel the fire" of a small or early-stage prostate tumor, but it's not clear that it can cause cancer in men who don't already have the disease. Nonetheless, most experts would agree on the following:
Only men with proven testosterone deficiency should use testosterone supplements. Men with normal testosterone levels should avoid these hormones, since they can cause a substantial number of side effects.
Men who have had prostate cancer or who've been treated for the disease should avoid testosterone supplements altogether.
Men with testosterone deficiency who decide to take supplements should be monitored carefully for prostate cancer, usually by having regular prostate exams and blood tests to measure prostate-specific antigen (PSA).
