As soon as we question traditional marriage, we must distinguish its various roles:

1. Sharing a household - not restricted by law but posing other problems
2. Having sex together- subjected to various legal restrictions, e.g. of incest
3. Raising children
4. Being accepted as a family by society
5. Being accepted as a family by laws of taxation and inheritance

Only the latter role is political in the current discussion, whereas weltanschauung is mainly concerned with the other roles. "Gay marriage" is a misnomer by more than one criterion.

Similarly, polygamy as a sociological problem is scarcely related to its legal acceptance. "De-facto harems" are not unusual, whether supported by a cultural/religious tradition or charisma or wealth, e.g. of a film star.

Large same-sex households, each member vowing fidelity and in some cases even wearing a golden ring, are highly praised in some traditional Christian communities - by the name of religious orders.