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abs anthro athletic barefoot biceps biped claws erection feet foreskin fur genitals grey_body grey_fur greyscale holding_penis humanoid_genitalia humanoid_penis looking_at_viewer lying male mammal monochrome murid murine muscular muscular_anthro nipples nude on_back pecs penis pose raised_leg rat red_eyes rodent shephard simple_background smile solo spelunker_sal spot_color spread_legs spreading text toe_claws url vein veiny_penis whiskers white_background white_nipples white_nose