Why on earth are we doing this in the first place, though? To find the right mate, of course. Our sweat broadcasts a bunch of signals about everything from our health to what kind of immune protections we have. People with different-but-not-too-different immune complexes produce the healthiest babies, so we're always trying to sniff out that special someone who has everything we need: good health, a great smile, and that bubonic plague immunity gene we're missing.
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