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Ya, It would be good to merge dildo, vibrator and anal_beads into sex_toy or such.
I have a list of some tags that IMO are unnecesary, too specific and/or people don't care to tag them so they're being unused.
tail
apron
angel
cape
sword
devil
sheets
suspenders

About pussy_juice: I think it was implemented by vistigris to rate 'e' on some posts that wouldn't have enough reason to be explicit when they really are, like post #111132 (nsfw) and to distinguish it of wet (with water).