I think of Dwarf women and Orc women as being similiar in that they are almost
as mythical as the Entwives to outsiders. Both races are militaristic by
nature, and would adhere to a very strict code of conduct for the
genders. Women probably resided deep inside the Dwarven halls and would
have been protected because there were so few of them. Orc women no doubt
are in some kind of hideous breeding space, but Dwarf women too might live
together working on large-scale projects such as sewing, etc., except for the
few that are married to Dwarf men.
As others have suggested, Aule might not have known Eru's mind in the area of
the female sex. The Valar knew a few parts of the music very well, and
Aule's favorite melody involved bushy men hammering things and forging mithril,
etc. He thus made women as best he could, which was not very well
indeed.
But to Sam the evening deepened to darkness as he stood at the Haven;
and as he looked at the grey sea he saw only a shadow on the waters that
was soon lost in the West. There still he stood far into the night, hearing
only the sigh and murmur of the waves on the shores of Middle-earth, and
the sound of them sank deep into his heart. Beside him stood Merry and
Pippin, and they were silent.
