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

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

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

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

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.

I reply, telling her to come over and ask me face to face. She looks furtively around and asks me if I'm nervous. There is tension in the air like North and South Korea coming together to hammer out a treaty.

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.

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

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.

Your picture can be viewed only if you give a password to the person with whom you are conversing.

Suddenly the realisation of how odd it is to meet a stranger with the express intention of having an affair dawns on me. It's more like Alan Sugar interviewing an apprentice.

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.

The idea is presumably to safeguard people from searching for their own spouses on the site - though how a husband would explain to his errant wife how he came to stumble across her picture on a website for adulterers, I don't know.