No where in the constitution does it state love as a requirement for marriage.There is no valid reason to allow them to get married. Simply being in love is not a valid reason for marriage.Maybe. There is no valid purpose to get married if they are infertile. They can simply cohabitate.Nature made it so.
So if a male or female is infertile since birth, they should be banned from ever being married?
There is no valid reason to not allow same sex couples to get married. You don't get to choose for another who they love or how they express it to each other.
And you get to make that call, because?