There are many marriages that have no offspring; there are many offspring who have no marriages. Marriage is not a commitment to breed; it is a commitment to partner for life.

Ake, I do apologize for spouting names, but this has gone roundy-round a few many times, and I think that the core issue is being ignored.

You and GfS both seem to think that the civil rights accorded to marriage are about reproduction, although you have no qualms extending those civil rights to non-reproducing heterosexuals, or asexuals.

This is just self-contradictory with other statements about your liberal nature.