Crossword Genius

"On the Basis of ___" (RBG documentary) (3)

Ross

I believe the answer is:

sex

(Other definitions for sex that I've seen before include "Hanky-panky" , "VI (Lat.); m. or f." , "This symbol is epitome of glamour" , "Male or female" , "Expert in the treatment of coital problems" .)

I've seen this clue in the Universal.
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