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anthro balls biceps biped black_hair body_hair brown_body brown_fur equid equine flaccid foreskin fur genitals grey_background grey_body grey_fur hair happy_trail hooves horse humanoid_genitalia humanoid_penis long_foreskin male mammal muscular muscular_anthro muscular_male no_swift nude orange_eyes pecs penis piercing pose simple_background solo standing tail unretracted_foreskin