Hi Rivergirl
well I agree with all that has been said by other wise ladies
my daughters are 25 and almost 23 - I truly think having daughters is lot harder when it comes to sleeping over
I too think your daughter is bit too young and like the others advise you invite the new boyfriend over and get to know him a little
Your daughter will not be impressed by this am sure , but think it's the best way to go
Hope all goes well ! Good Luck