If you think your son's sexuality can be determined through any means other than actually having a meaningful, face-to-face conversation, then you need to waste your money on the "Is My Son Gay" French Android App.
The app costs
99 Euro cents
€ 1.99, which if you think about it, is a great deal considering it promises to answer "the question you have been asking for perhaps too long"! Or at least it would be if it actually did something... It's basically just a game of 20 questions featuring deep and thoughtful yes or no questions pertaining to homosexual stereotypes like personal grooming, manner of dress, enjoyment of musical theater, and his interest in sports (or rather lack thereof).
Lest you doubt its utility, the app "unfortunately" confirmed five-star reviewer Christopher's most-feared suspicions... Quick Christopher, you must send your son away immediately for treatment before it metastasizes and becomes contagious! [Android Market via RFI via the Awl]