When I first started exploring BDSM via the internet every picture I found was of these paper thin girls who didn't look like they were enjoying themself.
It took me a while to find "real" women who weren't ashamed that they were submissive, and were proud of their bodies and of how their Master/Dom had tied them up, or the marks from a spanking. I'd had it in my head for a long while that Doms were only looking for thin girls.