Aura of the mysterious is a minor perversion that a couple shares. A fetish that one of the two partners finds arousing, or a particular sexual scenario. Fantasies have to remain dirty. Cleanliness, scrupulousness and rationality are poison for eroticism.

When it comes to sexuality, people like to tell lies. It's only when it comes to money that they lie more.

You're married to a woman who has no objection to another woman joining the couple. Then she brings in her boyfriend. Suddenly you realize - my God! - you can love more than one person. In fact, you can love several people at the same time.

Some 95 percent of all sexual contact still occurs in permanent relationships. That's an impressive number.

Fantasies have to remain dirty. Cleanliness, scrupulousness and rationality are poison for eroticism.

I will always be referred to as a theorist, but I was only a fellow traveller with a degree.

I'm reminded of a female patient who was particularly aroused by the shape of her husband's shoulder. And this hint of perversion should ideally remain a secret for both partners.