Totally agree with you. Had something like this done to me while a gal sat on my lap in an overcrowded school bus during my senior year in high school. While it was without any clothes being removed it felt great when I finally let go with a load. The gal could sense the sudden warm in her crotch when I did and got up and moved across the aisle after a gal got off the bus. She looked over at me as I rubbed my crotch and smiled at her. When she realized what I had done her eyes grew wide and her mouth opened in shock. I never got to fuck her but at least I had a good dry hump.
I guess a little "performance anxiety" hit this guy as he doesn't seem to be able t get and maintain a hard on. Hell, I had a hard on after the first minute and still had one while typing this after 12 minutes then came as she finally got him to lose a small load,.