For over 2 years I have been having monthly PSA and blood-workup following treatment for Gleason 10 cancer right prostate half and Gleason 6 left prostate half. I found discontinuing my riding 5/6 days before blood draw worked good for me, HOWEVER, I had been riding 1 to 3 centuries a week so plenty of irritation. I am now on a 3 month draw and will still continue with the 5/6 days stoppage.