Here is some more;"Prejudice, we are beginning to understand, rises not from malice or hostile animus alone. It may result as well from insensitivity caused by simple want of careful, rational reflection or from some instinctive mechanism to guard against people who appear to be different in some respects from ourselves." (Golinski)
"As irrational prejudice plainly never constitutes a legitimate government interest, this court must hold that Section 3 of DOMA as applied to Plaintiffs violates the equal protection principles embodied in the Fifth Amendment to the United States Constitution." (Gill)
At it's most basic essence, marriage is a cross cultural constraint on evolutionary mating behavior.
Ss couples are a defective failure of mating behavior. Clearly not equal to marriage.