My (27f) boyfriend (25m) is uncomfortable sharing a hotel room with my dad (60)

My boyfriend and I are going on vacation next week! I'm really excited, except for the fact that he's not 100% comfortable with the room setup. Let me explain....
My dad (60) is extremely generous and has offered us the chance to go on vacation with him (something we couldn't afford by ourselves). Our flight is leaving super early in the morning so it makes sense to get a hotel close to the airport and stay the night before instead of waking up early to drive 2 hours to the airport. My dad went ahead a booked the room for 3. There will be 2 beds, one for him and one for my boyfriend (let's call him B) and I.
So B and I were raised very differently. His family is all about no sleeping in the same bed, no living in the same home, and no sex all before marriage. I grew up in a very open family so they know that B stays over often and we have sex often. He doesn't follow his family's way of thinking, however he's VERY respectful of his family's beliefs if we are all staying together. He's one of 5 kids so his family will get an air bnb for vacation and I'll have to stay in his sister's room.
I'm an only child with divorced parents so my family has never been big enough to need an air bnb. Hotels have always been just fine. The point in explaining all this is to understand both B's opinion and my opinion.
Now back to the actual problem. We were hanging out with his friends last night talking about vacation and our conversation went something like this:
Friend: That's so exciting you're going on vacation!! But with your dad? What's the room setup like?
B: We are all staying together, he's sleeping in the same bed.
Me: He is NOT sleeping in the same bed! He got 2 separate beds for us and for him.....? And that's for ONE NIGHT while we stay close to the airport for our flight. When we get to our actual destination, the hotel has one bed room for my father and B and I will sleep on the pull out couch in the living room.
B: Well he may as well be sleeping with us...
Friend: Ya, that's weird
I never thought about it being weird! I understand B and I are older to be going on a family vacation and it's different when he's used to a family of 5. But with me, all I have is my dad. We are very close and open and he would have never invited us is he wasn't comfortable with it.
B has brought up him being uncomfortable with the room setup from the beginning. But it's a destination we just can't afford by ourselves. It's honestly the chance of a lifetime so that's why he is going along with it. I just wish he wouldn't have announced it to his whole friend group that we were with. And it's double embarrassing that they also think this is weird.
Sorry this is so scatter brained. I'm mainly just embarrassed that his friends think this is gross and I feel a little disrespected that he would talk about my dad like that. But then again, I really do understand how he feels.
Help!
TL;DR My boyfriend is uncomfortable sleeping on the couch with me while my dad sleeps in his own bedroom and has talked about this with his friends... I'm embarrassed


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