John Milbank always has interesting things to say on ethics and religion. Here is his latest on the gay marriage discussion in Britain.
http://www.abc.net.au/religion/articles/2013/04/23/3743531.htm
He suggests that the push for gay marriage is really “a strategic move in the modern state’s drive to assume direct control over the reproduction of the population, bypassing our interpersonal encounters. This is not about natural justice, but the desire on the part of biopolitical tyranny to destroy marriage and the family as the most fundamental mediating social institution.”
He argues that “Heterosexual exchange and reproduction has always been the very “grammar” of social relating as such. The abandonment of this grammar would thus imply a society no longer primarily constituted by extended kinship, but rather by state control and merely monetary exchange and reproduction.”
He concludes that “a gay relationship cannot qualify as a marriage in terms of its orientation to having children, because the link between an interpersonal and a natural act is entirely crucial to the definition and character of marriage.”