My son having girls in his room?

Hi, posting on mobile but hopefully have worked out the formattingMy eldest is 11, and his best friend since reception class (I am in UK, so since they were 4) is a girl. His friend is around at our place at least twice a week, and him round hers too.They are really close, and I have always been fine with them being upstairs, doors closed and leaving them to hang out, I can hardly the laughing, playing on the computer and playing board games. I check kn them every so often to give snacks and stuff...My partner (sons step dad) mentioned this week that it may be time for telling them that they shouldn't have the door shut, or to hang out downstairs. It never really crossed my mind to do this as it's never been an issue and neither kids have ever shown that they can't be trusted... and they are only 11.I do admit that I still see my preteen as my baby boy, but should I now be starting to think about them not having as much privacy? My son says they are only friends and not going out together.My partner is in no way pushing it, but his suggestion has played on my head a little. via /r/Parenting https://ift.tt/2UYIouM