Why are Americans more open (not "open-minded"!) and light-hearted about than Europeans?

I live in Europe but I have a fair amout of acquaintance with the American culture. Here we are also multicultural and tolerant, we also have education at school and relatively low ages of consent, being topless at the beach is usually not considered outrageous, and prostitution is largely legal. However, we don't talk much about with out kids, educational and work settings are high-pressure environments that don't leave much room for occupational , but rather for boredom and time-wasting. We don't have spring break parties, or if we do, they're much less wild and celebrated, in fact I've never heard of any. Bachelor and parties are small obscure events, certainly not as widespread. A considerably smaller amount of the population has casual . is more privately lived, and the west-european production is small and latent compared to the US. Public propaganda of sexual well-being is also minimal.