Actually, you do. IF the artwork is porn. In fact, if you're not old enough, it's just flat out illegal. You'll go to prison for making that artwork. And you

Actually, you do. IF the artwork is porn. In fact, if you're not old enough, it's just flat out illegal. You'll go to prison for making that artwork. And you arguing that it's "art" is not going to find much resonance in US courts at least. You're likely to fail the Miller test if US citizens are the judges.