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2012 anthro athletic athletic_anthro athletic_male backsack balls biped butt darkgem dragon genitals greyscale half-erect horn humanoid_genitalia humanoid_penis looking_at_viewer looking_back male male_anthro monochrome muscular muscular_anthro muscular_male mythological_creature mythological_scalie mythology non-mammal_balls penis presenting presenting_hindquarters rear_view scalie simple_background solo standing tail