system
A chat on subreddit /r/NoStupidQuestions
human
“Fanny” in the US is a very quaint and old-fashioned term for the ass, something parents might teach their kids to say if “butt” was considered strong language.  

Is it still used in the UK as a relevant term for female genitals?  Is it considered vulgar? Because now might be the time for that word to make the definition switch here in America, like I can imagine little kids using it as a nicer euphemism for the vulva.
gpt
The UK has a plethora of different words for those areas. Fanny is probably one of the less vulgar ones, but it's not exactly a nice euphemism either. Definitely couldn't imagine little kids using it as an alternative.