Thrice-married Sam Schulman has a sprawling essay in the Weekly Standard entitled "The Worst Thing About Gay Marriage" (the lack of kinship, apparently). Isaac Chotiner pretty much lets the awful piece speak for itself:

The sense that Schulman has never met a gay person gets stronger by the paragraph, before culminating with this gem:

Gay marriage may reside outside the kinship system, but it has all the wedding-planning, nest-building fun of marriage but none of its rules or obligations (except the duties that all lovers have toward one another). Gay spouses have none of our guilt about sex-before-marriage. They have no tedious obligations towards in-laws, need never worry about Oedipus or Electra, won't have to face a menacing set of brothers or aunts should they betray their spouse. But without these obligations–why marry? Gay marriage is as good as no marriage at all.

He even cites Oakeshott to make his case. Brace yourself.