It is not right to speak for others

That's a silly generalization, I think just like here you would find a mix of 'antis' who think motherhood is beautiful or dirty, depending on individual outlooks.

The "antis' opinion" is a false concept, especially when applied to barely related issues like this.

Now, looking objectively: motherhood IS dirty. Something can be both beautiful and dirty (or clean and repulsive). Now that said, I'm not sure I would generalize motherhood as beautiful, but not as ugly either... it's more like it has a mix of the good and the bad.

But in terms of dirt: the whole pregnancy process they can become incontinent, and so are babies, plus they can't feed themselves either, so it's altogether pretty messy, with bodily fluids spraying all over the place. So it's not clean. That's the whole reason there's such a focus on cleanliness, it really needs it.