When I had Prostate problems I mentioned cycling to the consultant and he said that cycling will not affect the prostate. If it did- he would have all of the older members of the local cycling clubs on his books. As it was he had just as many- runners- gym fanatics or keep fit fanatics on his books as cyclists. What he had noted was that those that do physical activity recovered from any treatment quicker than those that did not exercise.

He also put a proviso on that though in that if any pain or adverse reaction was increased by cycling- then he would suggest cutting back on cycling to relieve any symptoms.