The Abused

What is it about tension that makes people bite their nails? I don't understand. It's not like it accomplishes anything at all, besides more discomfort. Freud has some theory on this, but personally I don't care. I'm sure anything Freud had to say would make me feel even worse about myself than any amount of nail biting would. Lucky for me, I am a guy and no one really cares how my nails look.