Alright this is an idea that either everyone will think is stupid or Supra will love. I was watching lesbo porn and the strapon was ribbed and I started thinking that this can be done to the penis. Check it out. Do your normal workout and then get erect and clamp. Then take a clamp and and put it on a little in front of the other one but not as tight and then another and so on. They would have to be in the same place everytime. Maybe string would be easier.