The porn video tag "gay fuck gay (gay)" can be understood as follows:
1. Gay: This indicates that the content is focused on male homosexuality, involving two men engaging in sexual activities.
2. Fuck: This is a slang term for penetrative sex or intercourse. In this context, it signifies that the sexual acts being performed are of a penetrative nature.
3. Gay (repeated): The word "gay" is repeated, which could either be emphasizing the male homosexual aspect of the content, or it might have been unintentionally duplicated by the person who created the tag.
So, in summary, this porn video tag refers to a video that features two men having penetrative gay sex with each other.