In answer to your last sentence - not at all.
I expect a gay couple (male or female) to consider the needs of the child rather than their own desires. How they get a baby is irrelevant to me, it's the age that I have a problem with.
Consigning a child to never have the chance of a grandparent or for that child to not have grandparents for their children is cruel in my opinion
So nobody who has no parents can have children? A bit harsh its bad enough being an orphan