Does excessive masturbation cause impotence? or stunt penile growth?

There is nothing wrong with masturbating. It is a normal healthy thing to do. Do not believe people when they tell you if you masturbate you will:
- lose your hair;
- lose you mind;
- lower your sperm count permanently;
- stunt the growth of your penis;
- become impotent;
- suffer memory loss;
- grow hair on your palms;
- become weak;
- have increased pimples;
- develop extreme body odor;
- die and go to h*ll.
But if you do masturbate you will;
- have less stress in your life,
- have a strong right (usually the right one) arm;
- have a smile on your face most of the time.
So if you have the urge to do it ten times in a day, just do it. Ninety-eight percent of men admit to masturbating and we know the other two percent are liars. Keep IT up and enjoy. No, it is not too much unless something starts to hurt and then you might want to slow down just a bit.

Do not make a habit of masturbation. Like anything else, do not abuse. It wasn't intended to be a natural occupation... Report It

Nope

Not even a little bit. You're not going to run out of sperm anytime in the near future. You more or less have a lifetime supply so to speak. Heck, how do you think really old guys have kids sometimes.

And it's going to grow to the size genetics has already predetermined for you.

Not at all. In fact, the opposite is true.

As long as you don't rip the skin on your penis or something like that, no.

The only thing masturbating causes is intense pleasure, oh and a small mess to clean up.