What would you do?

When DS was at university and brought his GF home there was no choice bedroom-wise as they would have to occupy childhood bedrooms that had single beds. I had to relax the rules years later as they did not marry until they were 33 and by then we had a double in the guest room.

Yes separate I agree

Oh dear

widgeon Complicit in a pregnancy? A bit over the top I think - it's not a crime to have sex or get pregnant. And what a shame that you view this relationship in such a negative way. A lot of marriages fail. My friend's daughter's traditional marriage that ticked all the "responsible" and "respectable" boxes, lasted less than a year and I know of several similar examples.

If young people want to have sex they will do it anyway. Better, in my opinion, that they do it in a safe and unhurried environment where they are more likely to take proper precautions.

I would give them separate rooms but ignore footsteps in the night.

Separate without question. Even better if at opposite ends of a corridor or landing.

Great name Frannytoo?

Cornflakes possibly the better option than
maybe drawingpins or carpet tacks
Blood on the carpet

Put them in the same room and padlock them into their onesies. That should cause you some merriment

Agree with Jaycee. Imagine the embarrassment if you out them in a double room and they don't yet have that sort of relationship! Then they have a choice. They can creep into each other's rooms in the night or not as they choose.
Alternatively ask the parents or ask the couple themsleves (discreetly! )
I have to admit to being a bit old fashioned -I put each of my children's gf/bf in separate rooms - until they'd been going out for long time and had moved in together so I knew it was serious. After that there seemed little point and they all got married in due course.
My parents of course wouldn't have dreamed of putting me and my bf in the same room until after we were married. It seemed very weird to be sharing a room at my parent's house!

Plimsolls?

Why not ask them? If they're both over the age of consent, a single room. Or if you don't feel comfortable about asking them, see if you can put them in adjoining rooms. What they get up to is their business.

As they are only 16 it would have to be separate rooms, if they were older, had a longer relationship or were living together that changes things. I would also turn a deaf ear to footsteps in the night

I don't know the law in the US regarding sex between teenagers, but in most states it is statutory rape to engage in sexual intercourse with anyone under the age of 18, but I don't know if that applies if both parties are under 18.

I would certainly put them in separate rooms, unless you are absolutely certain both set of parents know they are sleeping together and are okay with it.

Schools have broken up again,

didn’t we have this question a while back, are they still on their way to the UK then?

The other Grans just aren't getting that this is a wind up!

Why is this a windup? ?

At age 17/18 DS and long term girlfriend used to stay overnight. I always made up separate room for girlfriend and told her it was there for her to use if she chose and then left it up to them..

Because it is so similar to previous windups, and because the school holidays have started. The kiddiewinkies, bless them, have nothing better to do than see what the auld grannies will say about something they hope they will think mildly shocking. If you keep your eyes, you soon start to recognise the posts.

My suspicions were aroused by the opening words. Would it not be more normal to write "My 16 year old grandson". Using the indefinite article suggests a hypothetical situation to me.

Oh no, don’t give them clues Greenfinch, they’ll be harder to rumble bext time! ???

Point taken Squiffy I hadn't thought of that. You are quite right.

My ex husband put my daughter and partner (now married 5 years) in separate rooms. They were about 34 and 37 at the time and were already living together. Bloody ridiculous. If I were them I wouldn't have stayed with him and his wife. I would have said we are a couple and are already living together as you know. If we cannot share a room, we won't visit. He is doing the same with my younger daughter of 32 and her partner who have been living together for about 3 years.

And dont rush em with their breakfasts!

Oh I didn't realise they were only 16. Definitely separate rooms then.

At 16 separate rooms, bunk them in with your own kids of the same sex if needed. Other countries have much more conservative views and surprisingly the US is one of them.
Over 18 ask the girl which she would prefer.