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.

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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.

I wonder if anyone has ever read this, seen the wisdom of it and decided not to join. "I'm witty, charming, handsome and modest, and I'm kind to animals," I write, hoping this description will have a fairly broad appeal, and also include a recent photograph.

Reading between the lines, I suspect she wants to meet again.

Sadly, I feel I have got all I want out of our brief relationship - two cups of coffee and a short conversation - and it's time to move on and find someone new.

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.

In the end, we agree to part and she wishes me luck and assures me I'll find the perfect paramour. This was like having a meeting with a new accountant with a helping of self-disgust thrown in.

Later on I'm perplexed when she sends me two flirty text messages.

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).

Many of them are middle-class, many have young children.