I'm not sure I'd ever like to say anything to somebody directly, but it has turned me on the few times a third person has compared my large penis to somebody who was really small. I remember in high school, I was taking a shower next to one of the lineman on the football team, who was big and overweight but had a tiny penis. Somebody pointed it out..."Look at that, small body - huge dick next to a huge body tiny dick" Everybody laughed at the other guy's expense, and I laughed a little too but I had to admit it turned me on, all the sudden attention. Somebody even pointed it out and mentioned "Look, his dick is even stretching out longer." So I turned away and got my butt out of the showers, cause all of that was a little too much attention for me at the time.