Don't forget that until the inter-war years, the only way men shaved, never mind women, was with cutthroat razors. And even early safety razors don't look very convenient for shaving intimate parts. It was probably only in the 60s that 'ladies' razors' came on the market, and electric ones a good bit later.
one of my worst/ most luscious masochistic fantasies! (It features in IPCG, though with metal tweezers - but clam-shells would make excellently cruel natural ones)Some indigenous tribes in Polynesia used to torture captive women by using shells to pull them out hair by hair.