This porn video tag is a combination of two elements: "mortal kombat" and "sex". The first part, "Mortal Kombat", refers to the popular violent video game series with characters engaging in hand-to-hand combat. The second part, "sex", indicates that this specific video involves sexual content.
The tag suggests a porn video where characters from the Mortal Kombat universe engage in explicit sexual activities, either as an alternative or addition to their fighting scenes, or possibly even incorporating elements of the game into the sexual encounters (such as special moves or finishing techniques). The intent is to appeal to fans of both adult content and the Mortal Kombat franchise.