"There are numbers of different types of partnerships or pairings that may exist in society that aren't same-gender sexual relationships that provide for some right that we have no objection to. All that said... there may be on occasion some specific rights that we would be concerned about being granted to those in a same-gender relationship. Adoption is one that comes to mind, simply because that is a right which has been historically, doctrinally associated so closely with marriage and family."