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abs animal_genitalia anthro anthro_on_anthro balls biceps big_muscles big_penis bovid bovine butt canid canine canis cattle claws ear_piercing enzi eyewear flaccid foreskin fur genitals glasses group hair half-erect hooves horn humanoid_genitalia humanoid_penis interspecies male male/male mammal monochrome muscular muscular_male nipples nude open_mouth pecs penis piercing pose presenting pubes retracted_foreskin rhinoceros sheath simple_background sketch standing sudonym tattoo teeth thick_penis toe_claws wolf