My friends give me crap all the time (male and female).
I will have my hair really short for months at a time. Then, I'll just stop getting it cut. I'll let it grow out for 6 to 9 months. I've got blonde hair, and I think it looks good shaggy.
Right now it's short. I'll start growing it out again after Attack of the Clones, cause I'll wanna look like Obi-wan.