Cemar.

Why do people INTENTIONALLY want to deprive themselves

It is not intentional in my opinion. Even though I experience this very thing I do not understand it myself.
But I know I do not deeprve myself on purpose.It is just not a great need for me.
Now if I felt I could orgasm and choose not to that would be intentionally depriving myself.

I read something on someones thread about desire then stimulation and stimulation then desire. Lil probably knows more about this. I am the latter of the two I think this may be part of the reason. After a orgasm since there is no longer stimulation there is no desire to do it again.
It is the only half logical reason I can think of.