I don’t think any dad, no matter how approachable they are, is going to allow his teenage daughter have a boy sleepover.
Back in the day, senior in H.S, I would be out with my girlfriend and head back to her house and make-out in her room (no sex). Huge house, being a dumb kid I never thought of her parents catching us - cuz we weren’t really doing anything. But it might be 2 am when I would leave, with her sleeping on her bed. Yeah - pretty stupid walking through the house as I was leaving at that hour.
I recall dropping by after being gone away to college. Even if she wasn’t there the mom would invite me in and hang out. Even after we had broken up one time (and stayed for dinner!). Good people.
My brother told me a trick for my daughters’ boyfriends.
Toss them a bullet. Then say “If you ever make her cry, the next one will be coming a lot faster!”
(Yes, they have cried. No - I haven’t shot anybody. Yet.)