"Toothing" is a new craze where strangers on trains, buses, in bars and even supermarkets hook up for illicit meetings using messages sent via the latest in phone technology.
"Toothing is a form of anonymous sex with strangers -- usually on some form of transport or enclosed area such as a conference or training seminar," says the Beginner's Guide To Toothing on a website dedicated to the pursuit.
It is made possible by Bluetooth technology which allows users to send phone contacts, pictures and messages to other Bluetooth-enabled equipment over a range of about 10 metres.
Users discovered they could send anonymous messages to people they didn't know with Bluetooth equipment, spawning a craze dubbed "bluejacking".
Jon, aka "Toothy Toothing" and the guide's author, explained toothing was born after he was "bluejacked" by an unknown girl while commuting to work in London. After a few days of flirting, she suggested a brief encounter in a station lavatory.
"The meeting wasn't a romantic thing - it was purely sexual. Barely anything was said," he said via e-mail.
He said potential toothers begin by sending out a random greeting -- usually "Toothing?".
"If the other party is interested, messages are exchanged until a suitable location is agreed -- usually a public toilet, although there are tales of more adventurous spots such as deserted carriages or staff areas," his guide adds.