The porn video tag "first time gay" refers to a specific category of adult content featuring homosexual encounters. In this case, the term "first time" signifies that the individuals involved are experiencing their initial same-sex encounter. This could be either because it's their first time engaging in any form of homosexual activity, or simply that it's their first time with a specific partner. The tag "gay" makes it clear that this content is focused on male-on-male sexual encounters. Overall, this tag helps viewers identify and select adult videos centered around homosexual experiences between men, particularly those that involve novice participants in such activities.