Not really negative, but....
When I was younger I knew this guy "Gerald" who was kinda cool but also kinda douchey, but we smoked bud together, he was a "musician" hip jam band type, but he got laid, I was still a virgin. One time, I overheard a conversation, one girl telling another "I heard Gerald's dick was big" "Well, Catherine said she tried to give him head, but it wouldn't fit, so..."
Flash forward to me being 24, reconnected with this hottie little petite blonde with good size perky titties and a big booty, and she was staying in my apartment for the weekend for a concert. Fucked her six ways from Sunday, she watched me jerk off in the shower (dream come true!) so we were having fun.
So, I was getting the "King Treatment" one afternoon, laid down on the couch, smoking a cig, both of us were naked, I had one leg draped across her thighs, the other behind her back, as she sat upright and stroked and stared at my 7 inch cock, which looked even bigger in her petite hands.
She was only the second girl I had fucked, the first one who I got to watch as she played with my cock like that. I shouldn't have, but I had only just recently come to terms with the fact I had a bigger than average dick, I was curious, so I had to ask.
"What's the biggest dick you've been with?" She was an honest type chick.
"Well, the first guy I was with was really big..."
Well, I knew she had been with two guys I knew from my past, Gerald and Ryan. Ryan had been my friend growing up, he was a "poindexter" type. Curiosity got the best of me.
"Was Ryan big?" I already knew the answer because I remembered him admitting it to me when we were younger, but I wanted to hear her say it. It's really hot knowing how you stack up against the guys you grew up with.
"Haha no!"
"How big, compared to mine?"
So, she put her two fingers about 3/4 or so up the base of my dick, about the 5 inch mark, right where the shade turns from dark to lighter. Which was so hot, made me feel big, masculine, powerful (a feeling I had never experienced at that point). Shoulda stopped there lol.
"What about Gerald? I heard he had a big dick..."
"Yeah, he was REALLY big!" I saw the look in her eye as she pictured it. She was reluctant, but I got her to show me. She put her two fingers about a little over an inch above the tip of my dick.
Now, I'm not into SPH or anything, but this was really hot in a way that probably is what turns cuckolds on. Having her show me how much bigger he had, how much deeper he had fucked her, touching places I couldn't reach.
That was a great weekend!