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2012 abs animal_genitalia animal_penis anthro balls biceps biped close-up equid equine equine_genitalia equine_penis flaccid fully_sheathed genitals greyscale horse leaf low-angle_view male mammal monochrome morticus muscular muscular_anthro muscular_male navel nipples nude outside pecs penis pose realistic sheath sky solo standing vein veiny_muscles veiny_thighs worm's-eye_view