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abs absurd_res animal_genitalia animal_penis anthro anus balls braided_hair equid equine equine_genitalia equine_penis erection eyes_closed front_view genitals group hair hi_res horse leaning leaning_forward male mammal monochrome muscular muscular_anthro muscular_male narrowed_eyes nipples open_mouth pecs penis perineum rear_view satanic_monkey simple_background sitting spread_legs spreading standing tail trio