It is very common for American women to dress overly revealing, behave cheaply (partying, guzzling beer like a sailor, etc.) and sleep with anyone who says hello to them.
Why is this?
You go to Europe & though such women exist they are typically limited to lower & uneducated class society. Women who'll settle with whoever'll take them cause the men can't get better.
You got to America & it seems to be common among every society group. And unlike in Europe these women actually think they are worth more than second, third or fourth pickings for marriage, etc.