No! I wouldn't allow my dd to spend long periods of time shut in her bedroom with her bf.
She is older now but she was 15, nearly 16, when she had her first bf and he spent time with us as a family, chopping wood, going on bike rides, clearing a pond etc and they occasionally went off together on errands etc, but he ate with us as a family and then we drove him home. He never even went upstairs! I didn't forbid it, it just never came up. We live abroad, and I suspect that just isn't done here. But I wouldn't have allowed it if it had. They did spend the occasional rainy afternoon together in the sitting room, but anyone could have walked in at any time.
I don't care if anyone thinks this horribly old-fashioned or oppressive. That's what we are comfortable with as a family.
Just because a teen at 16 can join the army, get married in Gretna Green, have sex, doesn't mean that its ideal to do any of those things at that age, or that they have the emotional maturity to do so. I certainly wouldn't be encouraging it and saying "here's a private double bed, get on with it" why would I?
Imo, if possible, a sixteen year old should be focusing on exams, friends, earning a bit of pocket money, hobbies, challenging themselves in physical activities (sport I mean
) , learning independence, and last but not least, volunteering.
Dd will be able to make her own decisions at uni, when she has more confidence in herself and her choices. The difference between a 15/16 yr old and an 18/19 yr old is huge.