Hotness = physical attractiveness (1-10) x attitude (-2, -1, 0, 1, or 2), 20 being the absolsute maximum.

If the attitude is 0 or negative, there is no amount of physical attractiveness that can redeem her. She's a soul killing succubus.

A five who is warm and makes a great mother for your children and makes your house feel like a home and is really cute when she smiles is a ten.