If you've grown up in America as a guy, you know a hell of a lot about gender whether you think about it very consciously or not.

Just like we've learned (without really realizing it) how to watch movies and television from many deliberate directing styles, we've learned (without really realizing it) what we need to know about gender. Guys know a lot about masculinity -- we are on some level experts on it when we dress, walk, talk, play sports, make friends, date. Without talking about it explicitly we've all managed to pick up really similar ideas about what it is.

For instance, you know as well as anyone does what the most masculine activity is in each of these pairs -- Check them off if you want before going on.