You might ask: what about adjusting for height? Therein lies the elegance of the solution. The only beautiful tall girls are the slim and leggy type. Thus, 120lbs applies universally.
Tell her to lose weight.
Height is of no importance so long as they are shorter than you. Weight is also of no importance. But the correct BMI is 21 (18 to 22 is acceptable), and waist:hip ratio must be no more than 0.7.
Where's that homo who spams the fat hairy tumblr incarnate girl?
/r9k/ needs you, anon! This is what happens when you don't give us our daily dose. Fags like OP think they can muscle in on this territory.