Anyone who has been to a concert will have experienced the phenomenon that is the queue for the ladies toilet. Most of us guys have gone to the mens room having arranged to meet our lady friend(s) at a meeting point ( I'm thinking sports stadia here), only to be left waiting for an eternity. When the ladies eventually arrive they say "Sorry, the queues in the ladies were terrible".
Sooo.... some ladies think outside the box and run into the men's room - ok perhaps using a men's urinal mightn't be the most hygienic but some ladies(?) get over that for the relief a pee brings. Another way of doing that would be to use a cubicle....the lady mightn't even 'show' anything but would there be a bit of embarrassment for any woman having to walk out of a men's toilet past a line of men who can only 'believe' that the lady has performed her toilette in the men's room or perhaps something else with a lucky guy or guys?
The stuff of fantasy perhaps but, it would be a common enough occurrence and in Russia, going by some of the videos I've accidentally clicked on

.....ladies peeing outside during social events , particularly weddings and concerts seems to be quite common (yes I do appreciate that there is quite a difference between social mores in Russia and Norway as well as a greater availability or ladies toilets). Any merit in the idea Maren?