The first time I had sex she said "God, you're big" immediately after insertion. I was shocked because I'd always thought I was small.
I said "I'm really not" and she said "Yeah, you are. I feel like I'm a fucking virgin."
I'm 6x5. So, average. She was older and more experienced. Maybe all the other guys she'd been with were small? She was really tight, though. I put two fingers in her and couldn't get past the knuckles.
I was only called big one other time, a few years later, by a girl I had already had sex with a few times. She was riding me when she said it and I'm pretty sure she was just telling me what I wanted to hear. I was still nice to hear, though