What makes Penny from Big Bang Theory superficial/shallow/materialistic?

Stereotypes persist because there is a lot of truth in them. Blondes are often coveted more by men. Good looking girls are sought by men. Good looking girls wanting to attract men work on those aspects. They work on their wardrobes, perfume, flirting, etc.

Working on one item means you will have less time for other pursuits. A good looking girl working on her figure by working out might mean less study time.

You go with what works. Good looking girls don't necessarily capture men with their brains. They work on the physical. That's just the way it is.

one scene she said she'd have dated raj if she'd known his parents were rich. with her new job she confessed to flirting with people to get sales.

Cause she's a blonde

ngf