The confession comes as no surprise to sexologist Louise-Andrée Saulnier. "Making love to get peace happens more frequently than we think," she explains. But why act this way?

Psychologist Micheline Dubé gives us her version of the facts: "Pouting and muttering for three days is a kind of childish control that the man tries to have over his partner. When a woman reacts by making love to him, she attempts to reverse the roles and to take control of the situation. But it's just a short-term solution."

An old story

Using sex as a bartering tool is hardly a new phenomenon. Aristophanes, father of Greek comedy, created the character of Lysistrata in 400 B.C. In his eponymous play, the heroine gathers every woman of the Attic and the principal cities of antique Greece, which were at war.

She made them swear that they will refuse their bodies to their husbands until there is peace. The war was won by women! Lysistrata's persistence triumphed and the two warring Greek cities were quick to negotiate a treaty.

Of course, in Aristophanes' comedy, the cause was noble. But today, the currency of sex is a bit questionable.