Although Marie AdÃ laÃ de was much in love with her OrlÃ ans cousin , Louis XV warned PenthiÃ vre against such a marriage because of the reputation of the young Duke of Chartres as a womaniser . Although Marie-Ad Ã laÃ de was much in love with her OrlÃ ans cousin , Louis XV warned PenthiÃ vre against such a marriage because of the reputation of the young Duke of Chartres as a libertine .