My thoughts...
It is likely that Jennifer has trimmed or shaved since those previous films and to be in accord with the 1960s setting is using a merkin (the correct word), I see no reason to doubt her word.
That sort of film, literate, worthy etc. would risk at most an NC-17 rating and not an X rating.
It's doubtful that a brief exposure of lips would result in the denial of an R rating, if memory serves 'Basic Instinct' got an R and although they cut elsewhere, the infamous Shazza shows the cops the goods scene was in the R cut.
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