Wikipedia says the term analingus was coined in the late 19th century and my cursory glance at google showed that there were explicit references to eating ass in early modern texts (~1500s). So tongue punching the fart box is at least as old as the Renaissance. Take the precautions you would normally take for butt stuff (disease free, recently bathed, haven’t pooped or eaten in 3+ hours, an enema if you’re fancy) and you should be just fine. Eating ass is fun and I will die on this hill