You misunderstood me (or I didn't explain myself properly!)
I don't equate a family with a woman not working, I was just explaining why they have to take a new partners income into consideration when working out maintenance, because of circumstances like that. If moving in with a new partner doesn't affect anyone financially then there is absolutely no reason that maintenance can't stay the same. CSA calculations are the minimum requirement, that's all.
My point about being a family is everyone works together and contributes to the family. Otherwise what's the point, why move your children in with your boyfriend? Not really fair on the children to live with someone that is not family. And often it IS the woman who hasn't been able to progress her career due to being a main carer.
None of this matters really if you are happy with your set up, but personally I wouldn't like my children living with someone who saw them as a financial burden and separate. And I also don;t think that that people willing to create a family shouldn't have that option simply because they don't have a lot of money.
Work full time on minimum wage you still need benefit top ups, that's lost when you move in with someone if they earn a certain amount.
The living wage is not really a living wage, so you could be working your bum off then struggle to get by while your partner who you live with is sailing through. I genuinely can't understand why anyone would want to subject their children to that - knowing that they don't matter to Mum's boyfriend. See your boyfriend on your own time (not you personally, anyone in that situation).