Personally, even if Ben was just Dante/Britt's and not Dante/Lulu's, I don't think it mitigates what she did. In that case, the story would be that she took a patient's sperm sample, that he only intended to have used to create a baby with his wife, and used it herself. If a male doctor was using his own sperm to impregnate his patients without their knowledge or consent, people would (rightfully) call it assault, and there would be a demand for him to lose his license. It should be the same in the other direction.