I used one for a while who I met on Truenudists. It was non-sexual, I made very good gains in my workout, but he had to stop because his girlfriend didn't like the idea of him doing it. We would meet for three consecutive daily one-hour sessions during which he would show me how to do each routine and we would review them. I would report back on the third day with any questions I had from my experience doing those assigned routines at the gym. We then would meet again three weeks later and repeat with him giving me new routines. It was reasonably priced, it was a nice twist to work with someone while we were both naked, and he was a decent guy who knew what he was doing. I tried reaching out to him during the lockdown but to no avail. I think he's missing out on a great business opportunity!