I think you need to have a little talk with him, like DragonsLair says, and be firm. You have the right to feel comfortable, and if someone isn't respecting that, then maybe you should consider moving on.
I'm intrigued by one statement you made: "On one instance his wife even became upset with him when he spent too much time watching my wife in the throes of ecstasy." I assume from this that his wife has no desire to see him with another woman? Perhaps you can enlist her help in settling him down, especially if she's enjoying being with your wife.
Still, I wouldn't be too hopeful that he'll stop pushing. I wouldn't trust anyone who lied to me and he's obviously wanting something you all can't deliver.
-B
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