rule 34 arm tattoo big penis black body black fur blue eyes blue hair bodily fluids bovid bovine casual exposure casual nudity cattle dark hair ear piercing exhibitionism facial piercing fur genital fluids genitals hair hi res horn lip piercing long hair male male only mammal medial ring medial ringed humanoid penis muscular muscular male nipple piercing nipples penis piercing precum solo sweat tail tuft tattoo torfur torfur torfur tuft vein white body white fur 7196001