Actually if you could get beyond the Amsterdam sex shops and travel throughout the regions of Europe, Latin America, and other areas (where the real people live not the tourist strips), you will find plenty of other cultures who are as "hung up" on modesty and sexual restraint as are many Americans. It's called cultural survival. Degenerate societies throughout history have self-destructed.
Sorry, but I don't have an inferiority complex when it comes to Europeans so your pseudosophisticated, peer-pressure argument doesn't carry much weight with me.