What was it?
To begin with, Homer went into the "same-sex marriage" biz for the money. Then after all the gays were married, he decided that he would marry any 2 things with the bucks for the ceremony.
They specifically show him marrying a brother and sister, end even when Ken Brockman intrbviews him and the reverend Lovejoy, Homer says, in essence, it doesn't matter any more. There are no standards.
More than our side than not and I won't ruin what I thought was a pretty funny end.