I'm a bit of a tomboy, always have been although I like some girly stuff too.
A lot of the things I'm into are traditionally more 'man things' and therefore all the people I know that do them/are interested in them are men. Not that I mind being friends with men, I quite like it in fact but sometimes I wish I had another woman to get a different perspective on some of the stuff I really enjoy.
I don't have a lot of friends anyway and the ones I do have are either female and not interested in the stuff I like, so we don't have that much to talk about, or are men who like the stuff I like but not a combination of the two :(