My step fathers niece lived with us for while. She was 17 and of no relation. She would get home late either from working or partying and would take long baths.
Our bathroom had poor ventilation so it always got extremely hot in there. So, on occasion I would sneak out on the back deck and hang out by the bathroom window she inevitably cracked.
There was only a small crack to look through and you didn't see much unless you were lucky, but it was enough for a very determined 14 year old to take advantage of.
I love voyeurism and I'm always on the lookout for an inadvertant glimpse of something that I shouldn't be seeing.