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2003 anthro anus arm_support backsack balls biceps biped butt enzi eyewear foreskin genitals glasses grey_body half-erect horn humanoid_genitalia humanoid_penis kneeling looking_at_viewer looking_back male mammal muscular muscular_anthro muscular_male nude penis presenting presenting_hindquarters presenting_penis rear_view retracted_foreskin rhinoceros solo sudonym tail tail_tuft tuft