Parody, playful, tongue in cheek: Invisible Girl/Boyfriend.
Created during a StartUp Weekend, according to the site: “Finally. A girlfriend your family can believe in. Invisible Girlfriend gives you real-world and social proof that you’re in a relationship – even if you’re not – so you can get back to living life on your own terms.”
Seems the invisible boyfriend was an afterthought, click far right in the corner for that option. No guessing the gender of the project initiators then 🙂