The reason it was believed that masturbation
is because during the dark ages
, the theory was that a human being
had 4 different humour
s (fluids) within them: blood
, yellow bile
(which was believed to be the same as brain fluid), and black bile
These had to have the right mix and temperature for a person to function correctly (this is also why temperament is etymologically derived from temperature. Many names for different moods are derived from temperatures/humours).
Hence, if you masturbated, you messed up the mix and could therefore go insane. This is also why sneezing was bad, as you lost some of your brain-fluid.
See also: The Four Humours.
Audited October 6, 2001