How do I ask my husband if we could have a threesome with one of my co-workers?

How do I ask my husband if we could have a threesome with one of my co-workers? My husband Steve is a wonderful husband and father, and my co-worker adores him. She has expressed interest in my husband on many occasions.
She is bi-sexual and I define myself as bi-curious, I guess. I have never slept with another woman before, but I have come very close to going all the way a few times…
I just don’t know how to bring it up… Advice?
You don’t know how to ask him?
How about: “Steve, my co-worker and I want to screw your brains out… Interested?”
That should do the trick.
You could also probably simply tell him: “Steve, get naked, a hot friend of mine is coming over in 5 minutes”.
- Dog
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