I 'insist' no such thing. I simply note that it is a integral part of a normal marriage. It can't be ignored, and it certainly can't be eliminated just because a relationship that would fail 100% of the time demands it.<quoted text>
You insist that procreation must be possible in order for marriage to be valid.
I'm asking you which federal law supports your opinion. So...?
I'm asking you to explain how a 'law' can trump a prevailing fundamental of evolution.