[MineralMan]

"The "test" for marriage should be can, not will, but can, it result in off-spring from the union of the principle partners. If the answer is no, it's a civil contract, nothing more."

And how would we know that? Perhaps a couple should have to be one where the woman is already pregnant before marriage.

What about older men and women? What about a young couple where one person knows he/she is infertile?

[TheAngryClam]

Bill Lockyer (the 60s something Attorney General here in CA) and his wife, who's less than half his age and expecting their first child, come to mind.

[elbucko]

And how would we know that?

Exactly! But we would know that a faithful, homosexual, union would not produce any natural offspring. That's the point.