Children is one aspect, but one would still need to regulate the relationship between the adults. Like who gets to pull the plug, for example.
And of course, there is no way to restrict babies to a lesbian, all we can do is decide whether to make it pleasant or force her to have a one-night stand with a male. As for gay men, quite a few come out of the closet after they've had children, and so they will have to care for children in their gay relationship.
Edit: also, epic lol @ the "morality can't exist without god"-argument above. Made my day, honest!
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