Question 1 - at what age does it become inappropriate for kids to have sleepovers with a member of the opposite sex? DD is 10 and as far as i know not at all interested in boys yet but at the same time, pretty mature for her age. There's a boy she's been friends with for years who is very nice but slightly akward socially - not big on social queues and what's ok and what's not sometimes. On the one hand they've had many sleepovers together before & I dont' actually think the kids are going to get up to anything they shouldn't (pretty sure it wouldn't even occur to them yet!) AND I trust the mum to be sensible. On the otherhand, at some point it's probably not going to be ok and it's just beginning to feel a bit weird but I have no idea how to put a stop to it or even if I should. 
Question 2 - similar theme - kids recently discovered TV show Friends by accident but decided it's really funny and they want to watch it all the time. Unfortunately it is ON ALL THE TIME! But even though there's never any actual nakedness or even terribly sexy scenes, they talk about sex a lot - sometimes quite explicitly. The other day I was in the room when the scene came on where Chandler wanted to know how to make sex go from good to amazing and Monica and Rachel draw him a numbered diagram. Fortunately (because I have seen every episode many times!) I knew what was coming and made them change the channel very quickly. I'm thinking I need to ban it all together but it's hard to explain exactly why.
Help!! (please)