This is an interesting thread. My two cents:
I haven't had any experiences that made my personal safety feel threatened. However, I am fairly new to all this and consequently had experiences that were not that great. Mostly dismissive, unprofessional and dissatisfying.
I booked this mature gentleman in NYC for an hour, and his place was filthy and in disarray. He was friendly and personable, but a few minutes into our appointment, in come these two guys, visitors of him, he explained, that needed to pass by us to the bedroom where they were staying. Of course, major mood killer. Attempting to get back to business, a few more minutes later I heard them passing again "because they needed the bathroom". I decided to stop, pay and leave. I gave him a bad review, paying close attention to my adjectives and adverbs, attempting at describing the situation as objectively as possible. A few days later, his add disappeared. Then he came back to both websites for escorts and masseurs with a different name.
The other one was one of those "donation up front" (as I said, I still consider myself in the learning curve of this) for a 90-minute massage. It was in Columbus, OH. His "massage" setup look more like he was going to perform an illegal abortion, a mattress on the floor and all the furniture covered. I was received with the Steven Wilkos Show blasting on the TV, and his massage materials consisted of some 99 cents store cream. He just rubbed my lower back for about 15 minutes, and here's the worst part. I turned to tell him that my body has other parts than my lower back, and when I turned to talk to him, I saw a camera on the wall, pointing directly at me. Needless to say, my internal reaction was the expected WTF, but my survival instincts told me to slowly, politely and calmly end the session. I did, and we had a friendly departure. Of course, I gave him a bad review, and he replied only to the part of my review that "it was me who ended the session early". At least he didn't accuse me of lying about everything else.
Fool me once, shame on you. Lessons learned. In fact, I wish I discovered this site before.