I think there is more bickering amongst the couple at meets, parties and club nights. As usually one will get gobsmacked by a new swinger or couple and his/her partner does not agree and is more likely to voice their dislike there and then.
Its quite a thing really as one of the couple has a go at the other. Often more like a bark or a growl. But I find that interesting. Usually once an agreement is met you don't see that side of things.