People will think you're weird, so you should shave.
You'll never get a boyfriend like that.
Wide eyed stares by: small children and guys trying to check me out.
You should shave, because it's (choose all that apply): dirty, unnatural, unappealing, unattractive, unfeminine, or demonstrative of a low standard of caring about yourself.
Obviously I don't agree with any of these arguments (if you can call them that, they're so flimsy), because my hair is staying, unless I get a whim to cut it off once in a while. Because in this case, I am a 'choice' feminist, and sometimes I do feel like shaving - just not all the time. Hence the choice part - what matters is not keeping the hair all of the time to enforce my standard, but being able to do both when and how I feel like it.
Another benefit: I can weed out potential partners more easily - anyone who would freak out over a little (or a lot) of hair and lose interest, they were never really interested in me anyway, because there are far more extreme (and alarming) aspects of my feminist self than hair.