So I paid £119 for a month's membership, giving me an entre to thousands of faithless females.

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.

One woman sends me a message heavily laden with sexual innuendo and I come to regard her as the mistress of the single entendre. Another woman's first contact with me included a plan for a day out together, including visits to art galleries, a stroll round a park and then "a few hours under the duvet". I'm later propositioned by someone who tells me she has an hourglass figure.

What I don't know is how her husband will feel about it. Aside from the little matter of her marital status, she also believes I have a wife, but she doesn't care.

She wants instant gratification even though we've exchanged only a few words online.

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

Our relationship, I note, has suffered because we don't spend enough time together (not surprising really, since she doesn't exist).

Her photograph reveals that the hour has stretched to 90 minutes.

I'm already starting to feel like I've had enough of this experiment.

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.

I register, and enter the murky world of two-timing technology, taking note of the warning on the site: "Not all affairs have a positive effect on a marriage." What a masterpiece of understatement.