"Fruit machine" is a jocular term for a device developed in Canada that was supposed to be able to identify homosexual people, or "fruits". The subjects were made to view pornography, and the device measured the pupils of the eyes, perspiration, and pulse for a supposed erotic response. The chair was like one from a dentist's office. It had a pulley with a camera going towards the pupils. There was a black box in front of it that showed pictures. The pictures ranged from the mundane to sexually explicit photos of men and women. There is no evidence of scientific validity of the machine.