Adult only. Private by design.
How to ask a guest to leave a lifestyle party
If someone has to leave, you say it once, in private, and you end their night. The room does not get a speech.
The short answer
Take them aside, or meet them at the door. One sentence: the night is over for them. Thank them if you can. Then walk them out. You do not explain it to the room.
Your host invites friends. The host invites friends they'd love to have there. One private link per couple. Ending a night is part of hosting. It is not a vote the other guests take.
Adult only. Private by design. You confirm you are 18 or older. The host still checks people in, and the host is the one who can ask them to go.
A reason you do not debate
They pushed a no. They kept a phone up. They brought someone who was not invited. They will not leave a closed room. They are too far past the house rule on drinks to stay. Any one of those is enough.
You do not owe a trial in the kitchen. Repeat the sentence once if they argue. Then the door. A long argument is how the rest of the night becomes about them.
If someone is in danger, get help. That is separate from a rude guest. You still do not turn the living room into an announcement.
A couple leaves together
If they came as a couple, they leave as a couple. You do not split them in the driveway and leave one partner to manage the story. If one of them is the problem, you still end the night for both.
Say it to both of them when you can. A private note to one, and silence to the other, is how a scene starts in your hall.
If they should not drive, help them get a ride before they go to the car. Do not send someone to the wheel because you want the door closed faster. The drinks guide is the house rule you already set.
The room does not get the reason
After they are gone, you do not brief the party. A short line is enough if people noticed: they headed out. Stop there. Names, details, and your irritation stay with you.
A private no stays private. Asking someone to leave does not publish their yeses, and it does not become a story the next couple has to hear. A one-sided yes stays hidden.
If the night can continue, let it. If it cannot, end it for everyone with the same private notes you would use for a host cancel. Do not leave people guessing in a group thread.
The format still belongs to the people who stay
A key party, a play party, or a speed date keeps going only for the guests who are still invited. All mutual-yes matches are revealed for those people, on the schedule you already chose. Someone leaving does not get a recap.
You do not reopen the list to fill their seat in the same hour. A full room that just lost a couple is not an opening. If you host again, you can decide then.
FAQ
Do we announce it to the room?
No. Say it to them, walk them out, and leave the reason there. The other guests do not need a briefing.
What if they argue?
Repeat the sentence once. Then the door. A debate in the kitchen becomes the night.
What if only one of them is the problem?
The couple still leaves together. You do not split them and leave one partner in the house to manage it.
What if they should not drive?
Help them get a ride before they go to the car. Ending the night is not a reason to send someone to the wheel.
Does leaving reveal their matches?
No. A one-sided yes stays hidden. All mutual-yes matches are revealed only for the people who are still there, on the plan you already set.
Who can ask a guest to leave?
Only the host. A guest who is uncomfortable can say no, or leave themselves. They do not eject someone else.