This porn video tag refers to a specific category of content that features homosexual acts involving naked men. The term "gay" indicates that the sexual activity in the video is between males, while "nudist" suggests that the performers are not wearing any clothes during the scene. This combination of tags implies that the video showcases explicit gay scenes where both partners are fully exposed and engaged in various intimate acts. It's aimed at an adult audience who have an interest in this specific type of content.