A commission reporting to the French National Assembly (Parliament) has returned the most coherent and intellectually formidable negative response to the advocates of "gay marriage" - (in French):
http://www.assemblee-nationale.fr/12/dossiers/mission_famille_enfants.asp. This is frankly astonishing, in view of the French tendency to PC attitudes and Chirac's hostility to anything that reeks of Christianity, but it shows that unless you pack your commission with journalists, activists and politicians, certain problems arise by themselves.