I found out about 4 years ago. A bunch of us were on some happy pills, piled up in the middle of the floor. I had my head resting on his stomach, just relaxing, enjoying the feel of the windbreaker-type material and all of a sudden his pants started rising. Given what we were doing, I thought I was hallucinating, so I reached out to touch it and still thought it was imaginary. I mean really, no one was that big! I made him get up and go in another room with me and show me, and he seriously had the biggest cock I've ever seen in person (still to this day). It was bigger around than a water bottle I know for sure, because that was the only thing around to compare it to. Well, that progressed into some seriously erotic rubbing and penetrating, but alas, no orgasm for either of us. The next day with everyone back to normal it was forgotten, and sadly, never happened again.
I agree with what that other person said though, I do use him and that night in my fantasies.