Brittle and bitten nails in a woman is a big turn off for a man. Eight percent of the male voters put it on the top of their list of big turn offs. So are nails just the tools for seduction or do they have other purposes too? Nails are useful in a variety of ways scratching clawing peeling an orange picking up a needle pulling out a splinter from a finger removing the plastic sheath from the bottle to name a few. But the main function of the nails is to protect the tips of our fingers and