Maybe you have caught her eye and she will be 'innocently' trying to synchronise visits from now on???
But yes there is a principal at stake here.... Most of the ladies business would be behind close doors i imagine, where we are out there swinging in the breeze so not particularly comparable... And I don't care what they do in European toilets, or Middle East toilets or frankly toilets out the back blocks of Africa... This what we feel comfortable with by Australian standards and what is good for the goose should be good for the gander so if women would object to male cleaners having the ability to have a glance while they were doing whatever then it should go both ways...
Just coz us guys tend to just put up with things and not make a big issue of it its no reason why we should always get the pointy end of the stick... How many changes did guys in male dominated work places have to make to ensure an environment that was comfortable for females to enter???