People have this misconception that when you have all girls you are "missing out" on something. I have never felt that way. Our three girls have very diverse personalities and all seems to have a great blend of being girlie and being...well, not so girlie. They will wrestle, play with dinosaurs and trains, shove and push one another, laugh at bodily noises, and get waaaay dirtier than I ever imagined little girls could!
I see no need to confine them to some definition of "girl". They surely are girlie enough all on their own, but even without a brother around they have this great sense of balance in their personalities.