The Bible's lex talionis – "Eye for eye, tooth for tooth, hand for hand, foot for foot" (Exodus 21:24-27) – has captured the human imagination for millennia.

But why stop at these parts? Or even limit ourselves to sprays? Half a century later, so-called whole-body deodorants—in sticks, aerosols, and creams—are all the rage. In 2017, a little ...