Although Marie-Adélaîde was much in love with her Orléans cousin , Louis XV warned Penthièvre against such a marriage because of the reputation of the young Duke of Chartres as a libertine .
Although Marie Adélaîde was much in love with her Orléans cousin , Louis XV warned Penthièvre against such a marriage because of the reputation of the young Duke of Chartres as a womaniser .