'Usually we just have a snog and a fumble but two have come back to my hotel room.It sounds dangerous, talking about it like that, but I trust my instincts to know who's safe and who's a serial killer.I have mum friends but I missed the buzz of male company I used to have and I missed the irresponsibility of my old life – going out on a Saturday and not knowing who I might meet, where the evening might take me.' To compensate for this, Wendy decided to take two annual week-long holidays alone.
The two most famous adulteresses in fiction, Madame Bovary and Anna Karenina, came to sticky ends: one poisoned herself, the other threw herself under a train.
But today the guilt that tormented these classic heroines is largely missing.
'They probably did online dating when they were single, so that's where they'll immediately head to see what's out there,' says David Miller, who runs Loving Links, an online dating service and one-to-one introduction agency for 'nice, middle-class attached people'.
Since founding the business 15 years ago Miller has noted a huge increase in younger female clients.
Finding out that I could still enjoy a physical relationship was …' She searches for the word. I thought that whole side of my life had died, but with Michael it's been revived.' From Wayne Rooney to Tiger Woods, barely a day seems to pass without male infidelity making the headlines.
Female infidelity, however, has a far lower profile and, in popular culture at least, tends to have terrifying consequences.
One of the challenges Sheila hadn't expected was where to hide her sexy lingerie.
'I went out and spent a fortune at Myla on gorgeous transparent bras and G-strings – things I'd stopped wearing for my husband, Peter, even before we were married.
'It used to be very much an empty-nest phenomenon for the over-fifties, but this week alone I've met five new women all under 40.