Whenever a man walks in on a naked woman, or she walks in on him, he will stare briefly, bluster and turn around. He will ask (and sometimes demand) that the woman please put some clothes on. He'll even go so far as to give her his shirt if she has no clothing of her own. This will even happen if the specific man is generally of "low morals", who you'd think would gleefully use the opportunity to closely inspect the au natural specimen. This is common in stories where a woman who has no cultural taboo against public nudity finds herself in our culture. It also happens when Ms. Fanservice tries to work her wiles on someone who just isn't interested.