I know the OP started this thread with the theme of "guilt" after an AMP visit. May I introduce another aspect of emotion that I think I would feel if I participated in this sport? The way I would put it is lack of respect for yourself for doing something that is outside the bonds of a relationship or marriage. You know that you weren't supposed to, and most likely your SO would say it is dead wrong NO MATTER the circumstances, but you found a way to justify it anyway.
But my real point is that you had to pay someone for acting like you're wanted. You might argue that it's just a release and merely physical, but if it was truly that, it wouldn't necessitate a young hot thang with a tight bod whispering to you that "you too big". It does involve emotion, for at least that half hour. You feel like someone attractive "wants" you.
For me personally, I'd want her to actually want me, and not just because I'm paying her. That's why I keep in relatively good shape though I'm in my 50's, with the naive notion that the provider might actually be attracted to me and go above and beyond just to show it. Yes, that'll never happen I know. But I keep the dream alive when I walk in to every new provider hoping they'll think that "this guy's so much better than most of my customers, I can't wait to pleasure him with a great massage and maybe more." LOLOL.
So it is this thought and my principals that hold me back. I'm afraid of walking out thinking "I just paid someone to fake like they wanted to have sex with me". Instead, I really just paid someone to do something they never would have done otherwise. And judging from some of your descriptions, many of these providers are acting just mechanically, or not attractive enough where you'd give them a second look if you passed them on the street.
I know most of you will call me a pussy for thinking this way. I just don't think I could fully enjoy it during and after because I had to pay for something that should really be more fulfilling than just physically. Not judging anyone. I'm sure that I'm in the overwhelming minority in this and I'm actually jealous of you guys that can bust your nut several times a week with a variety of women whatever your situation is. I would probably enjoy life more if I didn't let my principles get in the way of having fun. Probably why I really don't enjoy life. My wife is willing to give it to me more than the 2x a month that we do it, but the lack of variety leaves me aching for more. Believe me, my desire is still there.