Out of curiosity guys what's the difference between European, Canadian, and American girls?

When I was away at university I met a lot of guys from different countries, and according to them American girls were more "wild" (trying to see what they meant by that). So for those that have dated European or Canadian girls and possibly American girls. What's the difference to you and why.
Out of curiosity guys what's the difference between European, Canadian, and American girls?
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