i wouldnt say ive had a sexual encounter in this topic, but definitely pretty humiliating.
i hit the gym pretty regularly, as im a pretty big dude (6'5" 215 lbs), and usually in the weight room. a couple months ago i was doing bench presses and this scrawny little guy, maybe like 5'6" or 5'7" comes up to the bench besides me, tries to lift like 50 lbs, and utterly just fails hard. Instinctively, I chuckled a laugh. when I saw he was blushing, I gave him some tips and continued my work out.
anyway, back in the locker rooms i was changing to go shower. im naturally a pretty big grower, and with the coldish water and a work out, i wasnt the biggest in that department. like 3 minutes into my shower i get a tap on my back, turn around, and its the scrawny dude, and he looks straight down at my junk and says "hey man, thanks for the tip earlier. i get it now why you lift so much" and kinda smiles and then walks away. his softie was like 6 inches, so i was definitely a bit jealous, and slightly impressed.