I agree that Prostate Massage is more in fitting with the other two I mentioned, since they are all terms used in describing AMP services. I was just pointing out all the alternative possibilities. Headache didn't give any context, so it would just be guessing as to where he encountered the terms he was looking to define. But if one were to surmise, best guess would be from one of the AMP threads. So, pardon the pun, you can take one from column A in latinonli's answer and two from column B in mine.
I hope you are following all this, headache, 'cause I realize you have little reason to listen to anything I say here. But we are giving you the straight dope, sir, so take it for what it's worth.