I recently had a session at a local AMP which nearly always gave me a strictly therapeutic massage (a HJ once in a great while), but this time the gal pulled off the sheet an placed my hand on my junk while she massaged around the periphery. She let me finish myself off, while I squeezed her ass. I've heard about this approach to the HE before on forums like this and I'm wondering if this is part of a new trend among the AMP community. Is there some loophole in the law that they're trying to straddle by doing this? I paid her $20 extra for that, but had no idea what a reasonable tip would be. Any thoughts?