Of course they don't.

"Are you all alone in there?" said one voice, hinting at a sharp bit of frustration. "The school shower is not your personal sauna!"

That was alarming for Anna to hear. She really wanted those girls to leave, and judging by the sound of that girls voice, Anna wasn't going to get privacy any time soon. With a thick cloud of steam still concealing her modesty, Anna meekly replied, "I'm almost done."

"You are wasting so much water!" The irritated girl insisted. "Do you know how hard it is to get clean drinking water in third world countries? We have a responsibility to save all the water we can!"

Clearly, the girl was keen on her social studies, to the point where she almost seemed condescending. She was not giving up on the water, even if it would make her late for class.

Anna didn't really intend on being wasteful, but she also didn't want to give up her steam cloud. It was the only thing that hid her. Still, this girl was being stubborn. If that girl persisted any further, she might have walked in after Anna, or worse, get a teacher involved. Anna wanted no part of either problem.

"Okay okay, I'll shut the water off," Anna meekly said, as she quickly turned the shower heads off one by one. As she did this, the silhouette of her naked form became visible. Then the redness of her cheeks began to shine through. Only one shower was still running, enough to justify Anna's nudity.

"I'm sorry about the water, it just um..." Anna turned around, trying to think of a good reason for having all of those showers on. "They um... all need to be ran once in a while, to make sure they still work right."
The excuse was lame, and it hardly seemed like Anna's duty to test the pipes. Still, she didn't want to admit she didn't have access to any clothes.