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abs anthro balls biceps casual_erection casual_nudity digitigrade dinosaur erection feet genitals grey_background hi_res humanoid_genitalia humanoid_penis kevindragon male manly muscular muscular_anthro muscular_male nude pecs penis prehistoric_species quads reptile saurischian scalie simple_background smile solo theropod troojhar tyrannosaurid tyrannosauroid tyrannosaurus tyrannosaurus_rex