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Region: The Bar on the corner of every region
I think Rule 34 would suggest the requesters are in fact not weirdos but instead are the statistical majority of the online population. Just tell them your fursona is a three-legged warthog with mange, ticks, and grass-breath.* I'm betting the requests will disappear.
* Hey, I actually looked up what warthogs eat. Ain't you impressed? But now I'm curious--are they asking for pics of your sh!t before, during, or after the flush? Some people have very specific fetish points.