Gov. Eliot Spitzer's Sex Addiction

This is by far the most intelligent article I've seen on why Eliot Spitzer qualifies as a sex addict.  He was highly ritualized in his preparation for acting out and highly compartmentalized in the ways he managed his life.  He was also reported to be quite "private" (i.e. isolated) having no real close friends. 

Preoccupation, ritualization, social isolation and compartmentalization are all earmarks of sex addiction.

To understand more on how the brain works and how Mr. Spitzer could have proceeded with these behaviors in the face of prosecuting others who did, read this Forbes article.

http://www.forbes.com/opinions/2008/03/12/spitzer-addictive-behavior-oped-cx_dpb_0312addictive.html