One of my 'straight' friends had a pair of yellow nylon shorts. He always wore them without underwear when he invited me over to 'watch TV'. The evening went as follows: he drank too much, started playing with himself through his shorts, and within a short time, we were both naked and well aroused, and well.... you know the rest. This went on for years (we were high school buddies, but this began when we were in our early 20s). He knew I was gay, and despite his proclaimed heterosexuality, I knew he fooled around with other men. Oh, and yes, he was quite well hung. Bottom line: When we were in our mid 30s, he married a woman and had two kids. It was the first wedding where I could say I had the groom !
We have seen each other intermittently over the years, and of course this subject has never come up - mainly because we are never alone. Perhaps one day it will... and quite frankly, I would not mind a repeat for old times' sake.... although I am sure those yellow nylon see-through shorts are long gone, they live in my memory and some j/o moments still.