rule 34 abs anatomically correct anatomically correct genitalia anatomically correct penis animal genitalia animal penis anthro areola balls barely visible balls barely visible genitalia biceps brown body brown fur digital media artwork equid equine equine genitalia equine penis erection fluffy fur genitals hair hi res male mammal model sheet mottled mottled genitalia mottled penis muscular muscular anthro muscular male navel nipples nude nude male pecs penis penis tip piebald sheath simple background solo tail tgt1512 tuft white body white fur 8077698