Very happy RM (rentmasseur and rentmen) client here. May super, many very good, many ok and only a couple of not so satisfying experiences. But no truly bad ones - no scammers or catfishers. Ever. Great way to find what you're looking for as long as you're willing to pay for it. Prices have gone up a lot in the last few years, but I'm fine with that. They deserve it.
Payment method is tbd determined by the provider, but most take some form of electronic payment like Paypal or Venmo. <10-20% are cash only in my experience. Typically paid after service, unless they are very cautious and think you might not pay. But paying in advance is actually kind of nice so you don't have to mess with it later.
The profiles tell you a lot about the individuals - what they choose to include and not, what they wear in their pics, how they pose, etc. You actually can get a pretty good feel for what they are like. Read the reviews, too. Very helpful. Even the cheesy "interviews" offer a glimpse into who they are. Then trust your instincts about who to hire - and who not to. My few bad experiences have been when I ignored my instincts.
Primary method of initial communication is texting to the mis-named "call me" number. They NEVER want you to call, understandably. Always text. Also not great to email through the site; too slow. A day or two ahead is ideal. If you want service right away, you may have to ask more than one or two guys before you find your instant gratification. "Available Now" just means that they are online, not that they were actually necessarily available now or soon. But in general, I find that most of these guys want to work and want to find a way to fit you into their schedule so they can make money (and possibly have some fun.)
Most important - Always be respectful and polite. Second most important - Always be upfront about what you're looking for. If you want something Erotic, make sure that's a service they have listed. If they do list Erotic, tell them exactly what you want so they you're not both frustrated later.
Anything goes on rentmen meetups, but on rentmasseur, the usual protocol is to start on your stomach. Initial massage proceeds as a traditional therapeutic massage would, working initially on your back. Then down to the legs, but with an occasional wandering hand. It's when you flip over that the real action begins. I'm nude 100% of the time. Provider nudity and touchability is variable depending on the boundaries they want to set, but as long as you're flexible to adjust to individual providers' boundaries, you probably won't be disappointed. In my experience anal touch is rare and penetration is rarer. So if that's what you're looking for, you should probably say so up front.
You can sometimes get a great massage and a great HE from a super hot guy. But not all providers are cooking on all burners. That's OK, as long as you leave happy. Don't necessarily jump on the hottest looking guy. At the end of the day, the job is for them to make you feel like YOU are sexy. Their being sexy is just initial table stakes. Most of my simply "OK" experiences were with guys who thought that their being super hot was 100% of the job, and that my being given the privilege of being with them was all they needed to provide. NOT. It's amazing how far a little enthusiasm and dare I say passion will go to liven things up and make you leave truly Happy.
Good luck and have fun!