This porn video tag describes a specific type of adult content. Let's break it down:
1. Gay: The content features same-sex male couples engaging in sexual activities.
2. Muscle: The performers involved are typically muscular or physically fit, emphasizing their strong and athletic bodies.
3. Gay (repeated): This repetition could be an emphasis on the theme of gay sex or a description of the content featuring two gay couples.
In summary, this tag refers to a porn video that features muscular, male-on-male sexual activities, either between two couples or multiple participants.