Medieval medical views on homosexuality are outlined. Three theories s
eem to have been present. The first considers homosexuality as a nasty
psychological phenomenon that ought to be punished rather than treate
d. The second theory suggests that an abnormal sensory innervation to
the penis requires intense sensory input to achieve sexual satisfactio
n. A third congenital theory proposes that homosexuality results when
the maternal sperm prevails over the paternal sperm. The most importan
t proponent of the first theory was Avicenna (Ibn-Sina, 980-1037 A.D.)
; a literal translation of the relevant chapter from his Canon of Medi
cine is given.