In the early 2000s, an electronic device based on the Japanese Lovegety wireless dating device was marketed as 'Gaydar' and reported on widely in the media. This was a keychain-sized device that would send out a wireless signal, alerting the user via a vibration, beep, or flash when a similar device was within . This lets the user know that a like-minded person was nearby. Artificial intelligence Stanford University researchers Michal Kosinski and Yilun Wang carried out a study in 2017 which claimed that a facial recognition algorithm using neural networks could identify sexual orientation in 81% of the tested cases for men and 74% with women by reviewing photos of online dating profiles. Kosinski voiced concern about privacy and the potential for misuse of AI, and suggested that his findings were consistent with the prenatal hormone theory of sexual orientation, which hypothesizes that levels of androgens exposure in the womb help determine whether a person is straight, bisexual or gay. PHT predicts that gay and straight individuals may choose to present themselves differently on their profile pictures or have different facial appearance. Two replication studies confirmed the main findings of this study. It also found that even when faces are blurred it is possible to classify sexual orientation. A blog post criticized the study for using photos from an uncontrolled environment. Rather than picking up on the facial structure, it was likely the algorithm was identifying factors in grooming, lifestyle, and photo angle; a small set of questions about differences including makeup use, facial hair, and eyeglass use was nearly as accurate as of the original study. See also Biometrics Biology and sexual orientation (physical differences) Electropsychometer Fruit machine (homosexuality test) Straight-acting References Further reading Gaydar by Donald F. Reuter () External links Public Radio Program on gaydar The Science of Gaydar: The new research on everything from voice pitch to hair whorl LGBT slang 1990s slang 2000s slang 2010s slang Stereotypes of LGBT people