Is prostate milking a myth?

Backstory: I'm a submissive male and my wife and I do "orgasm denial"—she gets to choose when I ejaculate, and it's not often. She keeps my cock locked in a chastity cage much of the time to eliminate temptation. Of course, I get intensely horny, so much so that after 7-10 days I can usually manage to ejaculate even when caged, simply by concentrating on a sex fantasy for 10-15 minutes.

BDSM websites far and wide claim that by rythmically stimulating the prostate, a man's semen can be "milked" out of him without triggering an orgasm, and that this can be used to keep him in denial indefinitely, since it relieves the pressure to ejaculate but without the enjoyment of orgasm. Sounds awesome, right? The problem is, I've been trying to accomplish this for months and months, but I can never get more than a drop or two of precum. I've used an Aneros and a variety of dildos, some vibrating. My wife has tried this on me and I've tried it myself, up to 20 minutes at a time. I'm sure we've located my prostate—the feeling of hitting it is quite distinct—but I've never produced a drop of anything that looks like semen by stimulating it. We've tried slow and fast, hard and soft. Nothing. The idea of this being possible is a huge turn-on for me, but I simply can't make it happen.

Are we just doing it wrong, or is prostate milking just a hyped-up BDSM fable? Do you know for a fact that this can work if performed properly? Does it only work for some guys? Is this even a real thing?

Unmilked

Sent from the Savage Love App for iPhone

Monday I responded to a letter submitted via the new "Savage Love" iPhone App and the tech-savvy, at-risk youth have insisted that I respond only to questions submitted via the new "Savage Love" iPhone App all this week. The "Savage Love" iPhone App got Unmilked's question to top of the pile—but my response is still after the jump.

You can make yourself come locked in a cock cage/chastity device just by thinking about sex—and you're seriously worried about your inability to successfully milk your prostate? Gee, U, don't look your gift junk in the mouth there. Being able to come just by fantasizing is a superpower—some would kill for that power—so who cares if you can't be successfully milked?

Sorry, sorry: you do, otherwise you wouldn't be asking. I've read about prostate milking but I've never seen a prostate milked successfully or met anyone who claims/admits to have milked/been milked successfully. It does seem like a BDSM fable, frankly, something that spurted from the fertile imagination of a submissive husband somewhere who wanted to have his orgasm and his orgasm denial too.

But I could be wrong—hell, I'm frequently wrong. So I'm tossing this one out there to the SLLOTD-reading masses because, hey, I don't know everything. Any successful milkers out there? Got some tips for Unmilked?

Spill.