Yes, but imagine.... being out for beers... getting pissed.... need to go to the toilet while walking to your place.... what do you do??? Find the first tree move up the skirt and off you go... Simple but effective...
Another example.... You are out with a chick you fancy a lot.... Eventually after some time both of you get horny... You find a safe place, like the girls toilet, lock the door, both of you move up your skirts and off you go!!!.... Again simple but effective!!!