'Body doubling' is the practice of working on a task alongside someone else — in person or over video — to make it easier to stay focused. It is widely used by people with ADHD, autism or general procrastination struggles. If your teen 'body doubles' with a friend on FaceTime to do homework, they are using a recognised productivity strategy. Wholesome and effective. Apps like Focusmate match strangers for the same purpose. Nothing romantic or sexual is implied.