Low status jobs (janitor, cashier, mailman, pizza delivery driver, garbage man etc) hurt your social frame key with regards to fast sex with upper class chicks (regardless of age). Making you socially unacceptable to fuck.
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Thats why I say avoid it if you got one, and let her assume you dont have a low status job via your looks/style, vibe, and personality.
They should be hooked to the point where they wont even believe you (and even laugh out loud cause she thinks your joking) when you tell them your real job anyway.