What is the best approach to dealing with your friend’s wife coming onto you and directly offering sexual favors?

A real good friend of mine was away on business, when I met his wife at the soccer field with our kids. The two of us and our kids went to lunch afterwards, and in the bathroom of this tiny restaurant, she approached me me and started kissing me and much more. This was extremely exciting for me, but on the other hand, I knew it wouldn't end well. How would you deal with this?

What is the best approach to dealing with your friend’s wife coming onto you and directly offering sexual favors?
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