>>/69/
So despite your site rules saying "Loli is fine", and the board rules saying anime loli is fine as long as it's not realistic, you have your own separate interpretation that bans any loli image that depicts vaginal sex because... you don't understand the definition of obscenity?
Protip: if you're going to quote the US code, you might want to look up what "obscene" means. Aside from merely being pornographic, the work also has to "lacks serious literary, artistic, political, or scientific value". This is quoted verbatim in clause 2B of the law you link, but in clause 1B, the word "obscene" is used, and this references the Miller test which ALSO requires the work to lack any of these qualities.
Most if not all loli pornography has serious artistic value. Art is expression of human creativity intended to be appreciated for its emotional power, and lust is an emotion. There is a reason why sites like 4chan and Gelbooru, both of which would permit the image in the OP, have not been taken down by law enforcement despite their servers being physically within the United States. This content does not break US law, and is protected by the first amendment (Ashcroft v. Free Speech Coalition, 2002). It does not meet the definition of obscenity.