Adult only. Private by design.
How to say no at a party

No is a full sentence at a lifestyle party. You do not owe a speech, a joke, or a softer version of the same word.
The short answer
Say no when you mean it. You can say it to your partner, to the other couple, or to the host. A match, a drink, or a long hello does not use up the word.
The host invites friends they'd love to have there. That invite is not a promise that you will play. You can sit the rest of the night out, or you can leave.
Adult only. Private by design. You confirm you are 18 or older. The host still checks you in.
Words that are enough
Pick one line before you need it. Practice it with your partner.
- No.
- We are sitting this out.
- We are done for the night.
- Please stop.
- We are leaving.
Who needs to hear it
Tell your partner first when you can. They should not learn it from the other couple. If the moment is already moving, say it to the people in front of you. You do not take it to the group chat for a vote.
Tell the host if someone will not stop, if you want a room cleared, or if you want help getting to the door. Message host is private. Use it when saying it out loud is the wrong room.
A one-sided yes stays hidden. Your no is not a card the other guest gets to read later.
Leaving is allowed
You can leave the play room and stay at the party. You can also leave the house. Thank the host if you can do it without a scene. The street was private on the way in. It stays private on the way out.
Leave with your partner. The car is for the two of you. If you want to talk about the night, morning is allowed.
FAQ
Do I have to explain a no?
No. A reason is optional. The word is enough.
Can I change a yes to a no?
Yes. A yes earlier in the night does not spend the rest of the night.
What if only one of us wants to stop?
You both stop. Talk in private. The room does not get a vote.
Should I post the no in the group chat?
No. Say it to the person, or to the host. The chat is not a courtroom.
Can we stay after we say no?
Yes, if you want to. Sitting out is a complete way to spend the rest of the night.