My son is just turned 16 and has just got his 1st girlfriend. I am really pleased about it and he seems happy. They are spending all their time together and I've had to impose making sure she goes home at a reasonable time, particularly in the week. He's known her for a while but have only been formally 'going out' together for a week. She is 15 and (he says) is 'experienced' (he is not) and they are not on the verge of having sex. He is asking if she can sleepover on Saturday with him on the floor and her taking his bed. I've said 'no' because she is 15 and he is only just 16 and they only just got together. Also I clearly am not ready for the idea of this and need to adjust to my son being a proper adolescent. He's basically a good boy tho' inexperienced and immature. She seems very nice tho' we don't really know her yet. Have not met or spoken to her mum yet but I get the impression that her mum's not too bothered what she gets up to - because "her mum trusts her" I'm told. Am I right to say 'no', when should I review my position and what next ?