If said lesbo recipient of donated sperm had the remotest particle of common sense, she would have seen this coming a mile away.
And crossed her legs at the mere suggestion of the concept.
Well, I suppose that's true. The situation wouldn't exist if she'd said, "I'm in a temporary relationship. It would be inappropriate and financially risky for me to have children." However, that would make sense. Expecting people to use sense will give you a headache.