From Vitradispersio:

It has long been noticed that by a chair on the toilet you can immediately determine the matriarchate in the family or the patriarchate. If it is customary to leave the chair by default raised - the patriarchate, down - the matriarchate.
There is still caterpillarism. This is if little that the chair is lowered, and the lid is blocked, so that the sacred cat does not drop into the toilet :).