"My preference is for a man who is much younger than me with rugged features," says one. This is a way of paying someone a compliment without typing out the words. And over the course of a week I get almost 100 replies, messages and propositions.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.

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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.

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.

And all of them are looking for an opportunity to betray their spouses. But I wanted to find out what sort of woman uses such a site.

So I paid £119 for a month's membership, giving me an entre to thousands of faithless females.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.I feel sorry for her husband, presumably unaware that the mother of his children is pursuing cheap thrills with strangers.But it claims to have more than 100,000 members in the UK.Many of them are middle-class, many have young children.She wants instant gratification even though we've exchanged only a few words online.