But it claims to have more than 100,000 members in the UK.Many of them are middle-class, many have young children.Despite this, she still seems keen to flirt with me.

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They are allowed to sign up for free as a way of ensuring the numbers are balanced between the sexes.

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.

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.

If you want a more immediate expiration of messages, you can set content to delete as soon as it's been opened and read.

Finally, there is protection against screenshots with no names displayed in private chat rooms.

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.

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.