Would/did you ?

I had boyfriends stay at home when I was young, and my boys girlfriends always welcome here. They would get together regardless so I like to think they feel comfortable to be in their home.

I had been living with my then partner at least two years,
stayed with his parents who made up two separate rooms
for us? her house, her rules! However in my home........

Wouldn’t have had a leg to stand on?

Of course, I obviously expected my adult offspring to be able to make adult choices

I’m with youNina - as long as it’s a long term relationship it’s the normal way. Making them sleep apart suggests that they are doing something ‘wrong’ and sinful and might lead to a young person thinking their host has no respect for their life choices.

Asking personal questions is also a minefield unless you have a very warm and accepting and respecting relationship.

I suspect your friend has had a different life experience and has very different expectations.