Are european girl less promiscuous and shy than American girl?

One of my friend recently moved to USA. When he was in Europe, he had hard time to get girls and he got frustrated. But in USA, within a month he fucked 3-4 girls, one of them is randomly picked from street. According to him, American girls are more easy and simple minded.

From my experience, in club I've seen lots of stunning girls indirectly flirt with me. Unless I give them IOI, very few times they directly approached me. Whereas I heard in US, girls openly approach guys.
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Are european girl less promiscuous and shy than American girl?
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