spaox : Uncut is a little different. Among anumber of other things, it's a smoother ride for whoever you are nailing - less friction as bryan said - but that goes for with a condom too. The condom poses it's own set of issues for the uncut guys. Ultimately though, there is not really big difference.
It does work either way.

Bryan: Only a small percent of circumcised men (who are the majority in the US) were circumcised for religious reasons. I don't understand what you were talking about. Circumcision is common in America, while religious circumcision in America is compartively rare.