In Sudai and Blumberg's "Love Detector" system described in their patent, users log in and enter a confidential list of friends and acquaintances who they are attracted to. The system periodically searches for pairs who have indicated a mutual attraction and notifies them, so that they can initiate a romantic relationship without fear of rejection. In the event that a person's feelings are unrequited, the object of their affection is never the wiser. As the patent abstract points out, "No notification occurs unless the system determines that a match in attraction or interests exists. If a first person's feelings or interests are not mirrored by a second person, the system will not notify either person and only the computer system will be aware of the first person's feelings for the second person."