(S+C) x (B+F)/T = V is the formula that describes the "ideal female ass" in shape, bounce, firmness and symmetry, according to psychology lecturer David Holmes of Manchester Metropolitan University in England:

S is the overall shape or droopiness of the bottom, C represents how spherical the buttocks are, B measures muscular wobble or bounce, while F records the firmness. V is the hip to waist ratio, or symmetry of the bottom, and T measures the skin texture and presence of cellulite.

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