What on earth has any of that to do with Marriage

But lets say there is a link somehow, regardless of the sexuality of the couple in either permutation the birth mother isn't around...
Lot's of women, no least my wife couldn't provide natural breast milk beyond the initial few days. So yet again what on earth has that to do with allowing gay couples to be married?
And even if the child is beyond the baby stage, what is it that a gay couple can't provide that a heterosexual couple can? And even if there is such a thing, then what has marriage to do with it?
On a similar tenuous link Fred and Rosemary West were a married heterosexual couple. Best not let any children near heterosexual couples shall we....
I hear it is your opinion but I think it is pure bigotry.