Madonna doesn't think a wife should withhold sex from a sloppy husband, but she does believe a wife should dispose of her late husband's prosthetic leg to spare the feelings of the wife's current mate. This was some of Madonna's relationship advice on NBC's 'The Marriage Ref,' where she joined actor-comedians Larry David and Ricky Gervais as a guest panelist on Thursday's edition. The show invites its panel of "experts" to help analyze real-life disputes between married couples, mostly for laughs.