50. Dye Job
Source: Women's Health
What They Say: "Pick up a box of drugstore hair color (the kind that eventually washes out) and go to town on each other. You'll get that sexy hands-on-the-scalp feeling along with the risky excitement of not knowing quite how it's going to turn out."
What We Say: That tingly sensation is not sexy. It's called burning. Your flesh is actually burning.