A friend told me this joke:

A Polish officer goes to a brothel.
After the officer is finished he immediately starts getting dressed. While he is busy putting on his boots the prostitute asks him: "What about the money?"
The officer answers proudly and firmly: "A Polish officer never takes money."

A Polish officer believes in the barter economy, so much is for sure. When it comes to love most of us believe in barter, some of us believe in unhappiness.