The tag "gay 69 (gay)" refers to a specific type of gay adult content. In this case, the term "gay" is used twice for emphasis on the fact that the video features two or more men engaging in sexual activities.
The number "69" typically represents a sexual act where two partners simultaneously stimulate each other's genitals - one partner performs oral sex on the other while receiving the same in return, resulting in both participants being 'at 69'. The term 69 can be used to describe videos featuring this specific sexual act between men.
Therefore, "gay 69 (gay)" indicates a video where two or more men are engaged in oral sex acts with each other, specifically the mutual oral stimulation often referred to as the number 69.