I posted earlier today about doing my sons girlfriends washing and in the replies a few people said they wouldn't allow the girlfriend to even being staying and found it inappropriate.
All mine and my partners children are between 16 and 19 and as long as I had previously met the person they want to stay I wouldn't hesitate when saying it's fine for them to stay.
Just wondering what other parents opinions are on girl/boyfriends staying as I've always seen it as absolutely fine.