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2020 abs animal_genitalia animal_penis anthro balls blue_balls blue_penis equid equine equine_genitalia equine_penis erection facial_hair genitals goatee grass hair halter harness hay hi_res horse male male_anthro mammal mane medial_ring muscular muscular_anthro muscular_male outside pecs penis plant ponytail sharp_stallion sheath sitting solo tanutanuki tree