Fully naked only once, the female therapist unexpectedly ordered me to remove my trunks so that they would not get wet as she would scrub my back before the massage. However she offered no towel or what so ever. Without any exaggeration had the full on rock hard boner for the whole session even when she asked me to turn around as she did my chest. There it was just shining of precum, foreskin fully retracted bouncing against my abs, tried to think of all the bad and sad memories but could not get any control of it. In the end she pointed me the open shower space at the other side of the room where I then walked all boned up without any draping. She brought me a towel and my boxers which I took still fully hard, quickly dried and stuck myself into them. At this point it felt just ridiculous to cover anything anymore. Thanked and left to the locker, she just smiled professionally . Nothing sexual followed and I felt mostly embarrassed as it was a high quality place.
As said I had no idea it would be fully naked. Just remember I considered twice at the counter if I would prefer a male or female therapist, wonder what had happened with the male one. As she obviously just enjoyed exposing me without any word or help in the pain I was going through