Translate the following English sentence to French:
"The basic problems concerned what the European Union has already included in Article 13 of the EC Treaty and the difficulty which some countries had in accepting the issue of sexual rights and its inherent diversity and the issue of sexual orientation."
Les problèmes essentiels sont fortement liés à ce qui, pour l' Union européenne, constitue déjà le contenu de l' article 13 du traité d' Amsterdam, à la difficulté de certains pays d' accepter la question des droits sexuels et la diversité qu' elle suppose, ainsi qu' à l' orientation sexuelle.