"BMI also affects Bodily Attractiveness. For each unit below underweight or above overweight, a modifier is usually applied to Bodily Attractiveness. For example, for each 0.1 BMI below underweight (18) for a human female, Bodily Attractiveness increases by 5. So, a human female with a BMI of 17.7 has a bonus of + 15 to Bodily Attractiveness."