When I was around 9, I was curious about the dark ring around the middle of my cock, worried it might have been some kind of skin disease, and just searched it on Google. I just read that it was 'a scar caused by corcumcision' and just shrugged and left it at that.
However, when I was 14 I had my first sexual encounter with another guy and his cock was cut, but cut waaaay tighter than mine. I could pull my skin up and over my glans even and this guy had nothing. I definitely didn't mind, I thought it was cool even, but that's when I started looking up more particular things about foreskin and corcumcision. It's become an integral part of my fantasies now, whether a guy is cut or uncut, I don't care which I just obsess over it: how much foreskin he has, how high and tight his cicumsision is.