Eating-out is a term used in the adult industry to describe a specific sexual act where one partner orally stimulates another person's genitals. In this context, "eating" refers to using the mouth and tongue to simulate the other person, while "going out" implies leaving your own comfort zone and venturing into new territories, metaphorically speaking. Eating-out is often used as a tag for porn videos that feature oral sex acts performed on either males or females.