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abs anthro balls biceps big_penis dinosaur erection foreskin genitals gerosandias081 humanoid_genitalia humanoid_penis king_of_dinosaurs king_of_fighters looking_at_viewer male monochrome muscular muscular_male pecs penis prehistoric_species presenting presenting_penis reptile saurischian scalie solo theropod tyrannosaurid tyrannosauroid tyrannosaurus tyrannosaurus_rex vein