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abs anthro athletic balls barefoot biceps biped claws feet flaccid foreskin fur genitals grey_body grey_fur greyscale half-erect humanoid_genitalia humanoid_penis looking_at_viewer male mammal monochrome murid murine muscular muscular_anthro nude partially_retracted_foreskin pecs penis pose rat red_eyes rodent shephard simple_background sitting solo spelunker_sal spot_color text toe_claws url vein veiny_penis whiskers white_background white_nose