sexual orientation-detection device fruit machine https://en.wikipedia.org/wiki/Fruit_machine_(homosexuality_test) https://www.wikidata.org/wiki/Q3753782 A device developed in Canada by Frank Robert Wake in the 1950s that was supposed to be able to identify gay men (derogatorily referred to as "fruits"). The subjects were made to view pornography; the device then measured the diameter of the pupils of the eyes (pupillary response test), perspiration, and pulse for a supposed erotic response. The accuracy and functional mechanism of the "fruit machine" was questionable. First, the pupillary response test was based on fatally flawed assumptions: that visual stimuli would give an involuntary reaction that can be measured scientifically; that homosexuals and heterosexuals would respond to these stimuli differently; and that there were only two types of sexuality. A physiological problem with the method was that the researchers failed to take into account the varying sizes of the pupils and the differing distances between the eyes. Other problems that existed were that the pictures of the subjects' eyes had to be taken from an angle, as the camera would have blocked the subjects' view of the photographs if it were placed directly in front. Also, the amount of light coming from the photographs changed with each slide, causing the subjects' pupils to dilate in a way that was unrelated to their interest in the picture. Finally, the dilation of the pupils was also exceedingly difficult to measure, as the change was often smaller than one millimeter. fruit machines fruit