Research reviews. It’s not something done by many providers, but the reviews here should make it clear which do and which don’t. Yes, be super clean also.
I'm know for it in Houston more than anywhere else for some odd reason I started getting reviews for it there more! Although it's tough with hygiene on some guys no amount of scrubbing helps so make sure your super clean like fingers In and all with soap
I had a massage provider here do that to me. First it was kinda unexpected when she put a finger back there. The next time I washed back there before going to see her and I was a bit more relaxed when she "massaged" me back there. The next time she really surprised me by licking me back there. Finally it became our norm with her using her fingers and her tongue while she stroked me. It was a sad day for me when I learned that she had flown back to LA.