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2018 against_surface against_wall andalusian_horse animal_genitalia animal_penis anthro balls biped black_penis blue_eyes equid equine equine_genitalia equine_penis erection genitals hair hi_res horse jericho_(ulfhednar)klongi leaning_on_wall long_hair male mammal masturbation monochrome muscular muscular_anthro muscular_male navel nipples nude penile penile_masturbation penis simple_background solo standing urethra