No, European women are easy. They are a lot more liberal than people in the States.
First of all, which country are you going to? If you hadn't noticed, the US is not popular with the rest of the world right now, especially France, Spain and the UK. So if you walk around acting like an unintelligible frat boy (they're stereotype of us) asking women to rub lotion on "your nice build" you're going to get little to no action.
It's a lot more cosmopolitan in Europe so don't be some nationalistic jerk, you're essentially in another person's home. It's natural that they will bag US politics, so try to understand why they would. And please... because this would be very painful to watch, don't ever talk about how much you like football.
Also, don't speak in a southern or texan accent if you have one. Try to learn a few phrases from their languages, although a lot of people in Europe know SOME english. Don't take the women out to American chain restaurants unless she really wants to... basically, try to assimilate into their culture.
Being American isn't really a bad thing in Europe. If you play your cards right, they'll find your foreignness cute.