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(focusing only on the posts with this tag I find preferable...) It probably has to do with the casualness that usually goes along with pussy peeks. They're usually not intended, at least not in a sexual way, which is hot to me. I'm not that into the girl acting all sexy for the viewer. I like it when it's playful, embarrassing, just plain casual, or even unknown the the viewee. Having less than a whole pussy in view is an amplification of these attributes.