wesleysh21: I'll share some of my experiences, but only for those that crave details, these are just the girls I got closer to:
I've had a few girlfriends gossip about me. The first told quite a few people, nothing specific such as exact inches, but definitely got her point across. And when I started dating my second, the first told her "be careful, he'll hurt you with that thing."
The second told anyone that wanted to listen about me. She was the kind of girl that didn't exactly begin the conversation, but always took it over when it pertained to size. I'm what most would call a "pretty boy," I'm a fairly attractive guy with an athletic build (but I'm slightly below average height)...the girls she told seemed both shocked and intrigued. Funny thing is, she did that "false measurement" on me. You know, my true "from the top" measurement is 8.25". She did the one from the bottom and got 10.5", so that's what she reported to other girls.

Where the rumor mill really started to fly was on an overnight trip she took for a school club she was a part of. In a large convo in the back of the bus she told everybody within listening distance about me...in detail. She also told one of her friends directly "he'd definitely hurt your little ass." Well, little did she know me and that girl would eventually sleep together, and I hurt her little ass (oops). Trust me, my size was a small part of it, talking to some of my boys that had been with her about her (we gossip too) we agreed that she just couldn't take dick very well.
The third girl was willing to tell everyone that I was great in bed, even told a few select people about my size. She mainly bragged on my looks though and the very fact that she was sleeping with me. Eventually, there was a one night stand on a brief vacation for me where a girl admitted she slept with me because of what this girl (the third) had said about my size and abilities.
The fourth girl worked with me and the third girl. After we had sex, she rubbed it in the face of the third girl as well as told female members of her own family. Never really told anyone outside of that.
The fifth girl I was with never told a single soul. She heard from the first two about my size, and admitted that made her go from really liking me to being willing to just fuck me any time I got the nerve to ask her. She was of the school that you don't tell girls about your man, cause in her words "you never know when a shady bitch like me is listening."
The sixth girl I worked with as well (different job, different state). She made it very clear to her friends and some select coworkers that she liked what I did for her in the bedroom. She never commented on my size. In part, because she didn't think it was all that noteworthy. This was the kind of girl that could care less about size, only what you could do with it. Like I said, I'm a slightly thick 8.25". Its large, but there are still guys much larger than I am. Like I always like to say, "my size puts me in the big leagues, but once I get to that level I'm the last man on the bench."
The seventh girl told her sister in great detail, as well as some friends of hers. She slightly exagerrated my thickness on purpose. She has one girlfriend in particular that none of them believe anymore, cause she always drastically exagerates. This girl never gives exact measurements, just talks about how huge these guys are. Long story short they definitely know some of those guys weren't big at all, lol.
My current girlfriend won't even discuss sex, forget size. She's a very private person, and doesn't feel that anything going on between the sheets in her life should be divulged to anyone. When the topic of sex does come up, she will stay completely quiet and just listen in, but never offers up any info.