Dsd is 18 and has a BF who is the same age.
Dsd lives with us and visits Mum one night per week.
BF has started staying at ours overnight in the last week or so, he's a nice lad and we are aware they are in a sexual relationship.
I'd like to gauge how often we should allow the BF to stay over? The last week, she has been with him every night albeit some nights at ours, one night at Mum's and some nights at his.