I've never had any desire to go forth and multiply. I'm much closer to YouAreHere's outlook on life in general than I am to Nadya's, but as I see it if I don't want to have kids it shouldn't matter what my reasons are. I agree with InfinitePossibility; if a partner of mine wants children he'll need to find someone else to do it with—a view I held even more strongly in my pre-poly days.
Do you have any idea how difficult it is to convince a doctor to perform a tubal ligation on a woman with no children? I was over 30 with over a decades' worth of annually asking "Can I have it done yet?" on my medical file before they allowed it.