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2010 abs anthro biceps big_muscles big_penis ear_piercing equid equine flaccid flexing foreskin genitals green_eyes grin half-erect horse humanoid_genitalia humanoid_penis looking_at_viewer male mammal mane mohawk muscular muscular_anthro muscular_male nipples nude pecs penis piercing pose retracted_foreskin simple_background smile solo tattoo thick_penis tribal vein white_background wolver_mustang