The idea of a tomboy has changed since I was a kid. Back then, a tomboy was defined by what she did and what she didn't do. Nowadays, tomboys are only defined by what they don't do. When I was a kid, tomboys were the girls who climbed trees, played sports, got dirty, and all that "boy" stuff. Nowadays, most girls do some of that stuff. And that's good. It's accepted that girls like to do the fun physical play that boys have always had dibs on in ages past. My daughter Rachel certainly isn't afraid to climb a tree or jump around or play sports. However, she's got a very definite feminine side to her as well. She loves wearing pretty clothes, princesses are the best.thing.ever, and playing with dolls is a given. I think these days tomboys would be the girls who didn't do the feminine stuff. And therefore, there are far fewer tomboys.
I wonder if the word "tomboy" will eventually go the way of "poppycock" and "icebox".