Don't blame your wife for another person/s lust. Just because they showed no discretion in their request is no way implicates your wife.
I was once propositioned by people I worked with. They were members of a swing club. They approached my very, very drunk husband first. He was all for it.
Their wives had not been informed...
Then they talked to me. I was flattered and shocked.
I let it slide till everyone was sober.
Then I pulled the guilty parties and their wives together and I gave them a very quiet talk on secrets and honesty.
I told them that although they had enthusiasm it was a huge breach of trust to ask us, before they asked their significant others. I also told them they should have done a wee bit better research.
Regardless, I had never been propositioned like that before and I didn't expect it.
You can't be faulted for another's tastes. I never gave any hint that I'd be into a threesome never mind a hexagon. Don't over think it.