Well, in my limited experience, in the Midwest girls pretty much just spread their legs immediately when they meet a guy from Britain.
I have only observed a couple guys from there though, and both could probably be considered alphas.
It's my understanding that Americans are pretty much viewed as slack-jawed dumbassses in most other countries. However, I've heard that in a lot of Asian countries like South Korea, Japan, Taiwan, etc, people go crazy for us. One friend told me how if you go to a bar there you people will practically line up to buy you beer. They all want to have their picture taken with you and talk to you.