VR stands for Virtual Reality, which is a technology that creates a simulated environment or experience, allowing users to interact and explore within the digital world. In the context of this porn video tag, "VR-VR" refers to content specifically designed for virtual reality headsets like Oculus Rift, HTC Vive, or Google Cardboard. These VR videos are filmed using specialized cameras that capture images in a way that creates an immersive experience when viewed through a VR headset. The viewer can look around the 3D environment and feel as if they are actually present within the scene, interacting with the characters or objects. This provides a unique and intimate viewing experience that is different from traditional 2D porn videos.