That analogy always bothers me, because you absolutely can increase throughput in your ..'business' with more women; an established ..'pipeline' of 9 women will produce one baby every month.

(There might be an off by one error there if you want to take it too literally; even aside from the variation in gestation period. Point is it is a parallelisable task, whereas the whole point of MMM is to argue that it's not parallelisable, that you can't increase throughput with more resources.)