I don't have a problem with courts tending to assume that whoever was the primary carer before the breakdown of a relationship should probably continue being the primary carer afterwards. Which, of course, is what courts do indeed tend to do unless there are good reasons why this should not be the case.
But I'd campaign very strongly against any attempt to make mothers automatically the primary carer simply by virtue of their sex. That is without question sex discrimination.
Must be hard for mother's if this is not the case and/or custody or joint custody is not given to them.
How do you think fathers feel? Or are their feelings not as important?