why is it wrong for a submissive to masturbate??

[thir]

Ok I respect denuseri but got to disagree. Also, "for all intensive purposes"? (shudder) I am not the grammar police but it is: "For all intents and purposes."

Apparently you are.
Isn't there something called 'freedom of speech' in your system? ;-)

Now, I agree if the dom does not allow a submissive to masturbate, ever, out side of a scene then ok they are morons.

I don't think so. It is entirely depending on what works for them.

But, if my sub masturbates without asking for my permission to play with my toy, then she is gonna be in trouble.

Fair enough, since that works for you :-)

Control does not always mean denial but you have to deny access sometimes or the request for permission loses its meaning.

Control does not in itself equal denial - just deciding how things are done.