"I want a man with a personality and looks to take my breath away." These are the requirements of the dark-haired, dark-eyed, 37-year-old Asian beauty who has sent me her romantic wish list.Reading it on my laptop in the aptly named Cafe Affaire in central London, I consider what she really wants: a no-strings-attached sexual relationship.Postings such as: "I want a man who can look after me and knows how to treat a woman. I'm surprised and unsettled by the forward tone of some of the material. Determined to avoid the connotations, I reply: "The Beatles." I never hear from her again.

But she is an old hand at this type of encounter and tells me she's met many men through the site, and that I was probably the only one who hadn't lied about my age.

"Sophia" tells me she thinks relationships have a shelf life of about ten years before boredom sets in, but that she stays married to ensure her children have a stable home.

But in the modern world, in which the internet has become a vehicle for all manner of impropriety, she regards this kind of behaviour as perfectly acceptable.

We have encountered one another via an internet dating service established for the sole purpose of enabling married people to commit adultery.

I feel sorry for her husband, presumably unaware that the mother of his children is pursuing cheap thrills with strangers.

By now, I have been contacted by scores of women, so I arrange dates with the ones who are prepared to meet me in the next few days. Blonde, slim and relaxed, she has already told me by email that she's been married for ten years, has young children, time on her hands and wants to add a frisson of excitement to her life.

This is how I find myself waiting for "Sophia Loren".

She seems rather on edge and sends me a text message at the time we're due to meet asking why I'm using the website.

It may sound like an unpleasant niche website for a handful of amoral people to whom wedding vows never meant very much.

But it claims to have more than 100,000 members in the UK.

In order to fit in with the general ethos of the website I have invented a wife.