Why do so many double naught fundamentalists want to make everything black and white?
Let's assume a man has a prostate infection and his doctor tells him keeping his prostate flushed will promote healing. Now let's assume this man is single or even married to someone who doesn't or can't have sex anymore, so he has no way of taking care of this situation, short of masturbation. Other than he could go to the doctor once a week for a prostate massage. A very painful and inconvenient way to do something that could be done in more pleasurable and much less intrusive manner.
Now, I know for a fact (much to my dismay) that just a regular ol' run of the mill prostrate exam is very uncomfortable (not to mention humiliating...you know we can fly people around in space, we can talk all over the world on a computer...can we not find a better way to go about this exam than our current methods? geeze). How much more uncomfortable would it be if that prostate gland were inflamed and infected, and to make matters even worse, chock full of fluid because a guy is going to Hell if he masturbates?
Let's use our common sense here, folks. It's like anything else. If you use it to come between your relationship with God or your relationship with your spouse, then it's wrong. But the same thing can be said of watching TV, or playing on the internet, even this board, for that matter, or driving your automobile or any and every other action you do. It's the heart, people. What are the desires of your heart? Why are you doing what you do?
Face it, men actually have a physical need for release. Totally aside from the emotional need and the stress releaving affects, there's actually a for real physical need that can lead to problems if not addressed, and/or impede healing should a problem arise. A problem which is very common in men over 40.
Women go to Hell if they touch, though.

I'm kidding, I'm kidding!