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2016 accessory anthro anus balls bear big_butt big_muscles blush bottomless butt clothed clothing erection foreskin genitals grey_background humanoid_genitalia humanoid_penis looking_at_viewer low-angle_view male mammal monochrome muscular muscular_anthro muscular_male necktie oaks16 partially_retracted_foreskin penis presenting presenting_hindquarters simple_background solo