FURVERT!

animal_genitalia animal_penis anthro anus backsack balls biped black_balls body_writing butt butt_shot close-up clothing english_text equid equine equine_anus equine_genitalia equine_penis erection furronymous genitals hi_res holding_penis horse jockstrap low-angle_view male mammal medial_ring penis penis_backwards presenting presenting_anus presenting_hindquarters raised_tail rear_view simple_background solo spelling_with_anus standing tail text underwear urethra writing_on_butt