Which begs the question, what if the teenage girl had been with her father that day?
There are all sorts of situations that people find themselves in that are not great. I don't think anyone feels great about having large numbers of strangers see them in a state. I don't get why a load of people the same biological sex as you seeing you in a state is significantly better than a load of people the same biological sex and of the opposite biological as you sex seeing you in a state.
I mean, when my father and I got covered from head to toe in duck crap walking through Drayton Manor Park I don't recall thinking "If only there were no women or girls walking by this would be so much better!" Similarly, when my father was dying of a brain tumour in a hospice, he didn't seem overly distressed when a female nurse changed the nappy he was wearing.
I think what most people want when they dealing with a state they're in is privacy from everyone except those directly involved in helping them.