So, you're nitpicking over the word "possibility"?
Such completely changes the meaning of what I said. They recognize that and want to change the argument around so they can get a foothold. That's hardly nitpicking.
If the possibility of raising children is the only compelling reason to marry, why should anyone marry who has no possibility of raising children?
Indeed. They may have reasons, but no compelling ones. One can find just as much sex, companionship, security, etc. outside marriage. The only thing unique is raising children.
There are heterosexual women who marry past the age of child-bearing. What is their compelling reason to marry?
If that is the only detail, none whatsoever. However, if they have children or grandchildren, providing the male/female role model example to those children is a compelling reason.
Do you feel people who do not want children or who cannot have children have no compelling reason to marry?
As long as the possibility exists, why second guess them?
Your argument is is what's hopeless.
I find it confounds your side completely.