Szondi test
The Szondi test is a psychological exam named after its creator, Léopold Szondi. It is a projective personality test, similar to the well-known Rorschach test. The test consists of a series of 48 different photographs of the faces of mental patients. The subject is instructed to choose the two most appealing and unappealing photos. The photos the subject chooses will supposedly reflect his or her own pathology.
Szondi further broke down the results into four different vectors: a homosexual/sadistic, epileptic/hysterical, catatonic/paranoid and depressive/manic.
Szondi believed that people are inherently attracted to people similar to them. His theory of genotropism states that there are specific genes that regulate mate selection, and that similarly-gened individuals would seek each other out.