Legal Question in Criminal Law in Tennessee

Under Tennessee law, if you are not more than four years older than her and she freely consents, yes you can legally engage in sexual relations. I do not know the answer under Mississippi law.

As for sending pictures of "body parts," (and I am going to assume you mean pictures of "areas normally covered by a swim suit") other than that being a really stupid idea, the answer is "NO" under Tennessee law. Worst, since the transmission would probably be across a state line and therefore involve "interstate communications" you run the risk of serious federal charges.