There are still plenty of 'hole in the ground' public lavatories, ( or in restaurants), in France and even in Switzerland. They are very difficult to use if you are wearing trousers - you have to roll the trouser legs right up to stop them getting wet. There is usually no peg to hang your bag (obviously designed by men) so picture me with my bag hung round my neck, my trouser legs rolled up to the knees, desperately trying to get up with no hand grips provided. I once pulled the down pipe off the wall by heaving myself up by it.
Women in Third World countries spend a lot of their lives squatting, whilst doing cooking outdoors for example, but we are just not used to it. My knees have strengthened through walking now, so it is getting a bit easier. If I am in the forest, I find leaning my back against a tree trunk is helpful.
(I wouldn't have dreamt of discussing anything so unromantic even 15 years ago - another of the advantages of age).