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.
"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.
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.
But if I'm going to find out what really makes these women tick, I need to leave the safety of the virtual world and see them for myself. I arrange to meet a 41-year-old mother of two who misses "romance and flirting", in a cafe in two days' time.
Now, I understand much more the masculine vision on relationships and couple crisis in general: they are inevitable and necessary." "I’ve been on Gleeden for quite a while now and I’ve never been disappointed. Okay, I’m a cheater, I’m kinda naughty, I cheat on my wife, but I’m having a blast and I’m happy!!
Every new encounter (more or less cheeky) makes me feel overwhelmed with joy. To me, it is now obvious that cheating is part of my life balance.
Our relationship, I note, has suffered because we don't spend enough time together (not surprising really, since she doesn't exist).
After a quick search, I get the measure of the women on the site.