I agree with you with so many women on this forum jumping to the "no, never, impossible" answer, to questions like the one on this thread or similar. Quite surprising.
I am on the bigger side and I've had several girlfriends (from different cities and cultures) in the past shared my dick pics or my size with her friends. Normally I got to know about it later on, but a couple of times they asked me beforehand if I was ok with her sending a pic to her friend.
Not only that, I remember in college there was a guy, who apparently was huge and I remember a girl telling her friends in front of me how huge he was.
And yes, to your point
@kahlua123 maybe it is a youngster thing. Since I don't see that happening when you're married with 3 kids.
There are many big cock obessed women out there, not only men are. And yes, they'd do things like these.