The porn video tag "gay-sex-party" refers to a scene or video where men engage in homosexual sex, specifically in the context of a party setting. In this context, "gay" signifies that the focus is on same-sex male sexual encounters. "Sex" indicates the explicit act of having sex. Finally, "party" implies that these sexual activities are occurring within a social gathering or celebration environment, possibly with other men participating in various sexual acts. This tag is used to categorize and describe adult content for an audience familiar with porn videos featuring gay male encounters.