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abs anthro balls biceps big_muscles dinosaur foreskin genitals hi_res humanoid_genitalia humanoid_hands humanoid_penis kevindragon male manly masturbation muscular muscular_anthro muscular_male nude pecs penis prehistoric_species quads reptile saurischian scales scalie simple_background solo theropod troojhar tyrannosaurid tyrannosauroid tyrannosaurus tyrannosaurus_rex