Steamy love letters from a Swiss gigolo to Germany’s richest woman have revealed how he seduced her and tried to extort millions after secretly filming their lovemaking.

The letters and telephone transcripts, which were leaked last week, show how the BMW heiress Susanne Klatten was drawn to Helg Sgarbi, a professional gigolo whose letters are filled with adolescent erotica.

The letters and tapes will form a key part of the prosecution evidence in Sgarbi’s trial for fraud and blackmail in Munich tomorrow.

“Dearest, do you remember how we fused in lust on the beach and you groaned loudly with passion?” wrote Sgarbi, 44, a lawyer.

Poems addressed to Klatten, 46, and other wealthy women, will be used by prosecutors to describe how he flattered his victims, some of whom were 50 years older than him.

“You are a very special lady, you live for love, and you are right to do so, because that is what life is all about,” Sgarbi wrote in another letter.

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