Should I let 17 year old DS’s girlfriend sleepover?

[walkingoneggshell]

Posted this in teenagers but no replies and I could do with some advice quickly.
He’s 17 and a half and she’s 16. They’ve been together about 6 months and she’s lovely. He asked if she can stay tonight as they want to go somewhere together tomorrow. He’s my first born so feeling a bit unsure. I know they have sex and we’ve had a chat about respect and contraception. My mum never have let my boyfriend’s sleep in the same room as me even when I was at university and I remember it made me feel awkward, but obviously they’re younger than I was then. Just not sure what to think.

But in reality not people can't really afford to buy a house until they are at least 22/23 probably older. I would prefer my DCs to live here to save the money so does that mean they are not adult enough to have sex? I just find that such an odd thing to say.

No one actually needs to have sex, even at over 18, or over 40, surely its because people want to? Where do these 18-20+ yos go to have sex with their partners (who they could have been with a few years by that point). Not everyone goes to uni so should they been shagging in parks or in cheap hotels?

IRL I don't know anyone who was over 18 when they had sex for the 1st time.