"Tonight - is monogamy killing marriage? If you let your spouse stray, will they stay? Rethinking wedded bliss in the 21st century." Believe it or not, that's how "Larry King Live" began on CNN Tuesday. Filling in for King was Ali Wentworth, comedienne, actress, and wife of ABC's George Stephanopoulos who in February did a striptease on the set of "Good Morning America" for her husband's 49th birthday.