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Vague in the application and definition - only a tiny subset of images displaying "facial expressions indicative of pleasure" had the tag and I know most of those were in fact added by a single user according to criteria nobody knew. Why those and not the others? Why such an arbitrary application?

I agree a "pleasurable_facial_expression" type tag is valid and potentially useful.

I'm not sure why there isn't a proper one, in fact, although it would be bound to be enormous so a case might also be made that it is superfluous (if you imagine most of the sex-related tags would have half their posts tagged "pleasurable_facial_expression" and there is some overlap with "happy_sex" and the like). In practice I have my doubts as to whether anyone would consistently add the tag.