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Who you want to find: A one-night stand who supplies the Dom Perignon and cashmere blankets.

So I paid £119 for a month's membership, giving me an entre to thousands of faithless females.They are allowed to sign up for free as a way of ensuring the numbers are balanced between the sexes.Many of them are middle-class, many have young children.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.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.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).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. It is: An app for matching up users in airports and during flights.