rule 34 2021 abs anthro arm tattoo bara black penis black sclera bovid brown body brown hair cabura caprine digital media artwork ear piercing foreskin genitals gloves marking goat hair half erect hooves horn humanoid genitalia humanoid penis looking away male mammal markings multicolored body muscular muscular anthro muscular male nipples nude partially retracted foreskin penis piercing signature simple background sitting solo sorincabura tattoo uncut unretracted foreskin yellow eyes 4962867