WHY do women wear nail polish? To show that they don't have to do manual labor. This signals that they are attractive enough to have reeled in a wealthy Alpha male and/or that they have a comfortable office job. Female status signals are EVERYWHERE!
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He's reading to much into basic vanity shit. Women have never really been in manual labor in anything but miniscule numbers. Signaling that even subconsciously would be completely superfluous.
