I've found that I can't alone as well.. but, on the few occasions when a women assisted, its been wonderful.
The first was an email from a dominant women. I was instructed to masturbate and then eat my own cum, for her.
I was happy to report my compliance to her the next day.
But even more satisfying is when you can get a women to deny you an orgasm, unless you agree to eat your own cum. She then teases you mercilessly until you beg for release. .. I've been snowballed..
One had me cum on her tits and I had to lick them clean.
A couple times I've been told to masturbate myself, on my back, and had my cum feed to me, by finger and spoon.
I want to do this more, but my wife finds it "too gross".