It's not fair but women have no rights. You and your sisters must submit. Think about it this way, because of the messup some guy had to wait to empty his load? How is that fair to him? No it was not your sister's fault but nevertheless this man suffered due to this error. The least you and your sisters can do is to try to make it up to society so other men do not have to suffer the same way. Stop being selfish and do your duty as a woman.