Rule 34 Dev - animal_genitalia animal_penis anthro anus ass athletic balls bell_bar bent_over big_balls big_butt blarf blonde_hair brown_skin bulge clothing crouching equine equine_penis exercise flaccid gym hair horse horsecock jockstrap male male_only mammal muscular nude penis presenting presenting_hindquarters straining thick_thighs underwear waist_band weightlifting weights work_horse workout|2644190328