Thumbs can have nudity and still be 2257 compliant, but they cannot be sexually explicit as defined in 18 U.S. 2256 section 2, excluding subsection E and simulated.
I have a similar policy on my TGP that thumbs may not be sexually explicit. I have to "fix" about one in five, but hardcore content isn't all that prevalent in the high heels or boots catagories.
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