Former New Jersey Gov. Jim McGreevey's gay sex life blossomed as an eighth-grader and continued with trysts in seedy Times Square sex shops and at an abandoned synagogue in Washington, D.C., he reveals in his new memoir. The disgraced pol also admits that as governor, he presided over a corrupt political machine at a time when he had only $7,000 to his name, according to a copy of the book obtained by The Post. The tell-all is filled with sex - including his first hookup as a teen with a "cute, blond, skinny" schoolmate he'd fantasized about.