Wow, some very differing opinions here.
I am certainly not trying to be a "cool mum" as far as I am concerned I'd rather my DD and BF be somewhere safe than experimenting elsewhere, like some of her friends have done.
There are plenty of rules/boundaries in place in our family, however, next year she will be 18 (17 next month) so I also want to respect her wishes to a degree, as long as there is no negative impact on the rest of the family.
Currently the boyfriend has to leave about 7pm to get home due to times of the buses, waiting around in the town centre 2 towns from us to get 2nd bus etc. It's not something I would feel comfortable my daughter doing any later than that, so why is it ok for him.
If they want to spend longer together on a Friday or Saturday night eg; movie & takeaway, they can't unless one set of parents can collect/take home. Not always possible if we have other plans.
It is a new relationship because they kept things on a friendship level first before jumping into a relationship and he gets on really well with the rest of us.
Hope that fills in a few of the blanks people were asking about.