One team of German researchers remarked, "Repeated firesetting, resulting from being fascinated by fire, etc., may be less a disturbance of impulse control but rather the manifestation of a psychoinfantilism, which, supported by alcohol abuse, extends into older age." Pyromania is considered a relatively rare impulse-control disorder in the adult population in North America
Read more:
http://www.minddisorders.com/Py-Z/Pyromania.html#ixzz4MXASZ1Wy
Freud described it as a manifestation of "aberrant psychosexual development"