Dogging

The term traces to Britain's railway and lay-by culture in the early 1970s. Wikipedia's article on dogging records two competing etymologies: one from The Sunday Herald, which describes the original sense as men who would “dog” couples having sex outdoors and watch their movements; another that traces it to the cover provided by walking a dog at dusk. Both senses survived into the modern usage, which has shifted from passive voyeurism toward more openly arranged meets coordinated through online forums and SMS, a change BBC News noted as early as 2003.

Geographically the practice has spread well beyond Britain. The Wikipedia entry lists documented activity in the United States, Canada, Australia, the Netherlands, Norway, Poland, Sweden, and Denmark, often clustered around well-known car parks and roadside picnic areas. Etiquette varies but typically includes signal flashes (interior lights on or off, hazards), a no-touch default for spectators unless explicitly invited, and quick dispersal if uninvolved members of the public appear.

Legality is the constant qualifier. Even in jurisdictions where private adult sex is fully unregulated, public-place sexual activity is almost always an offence, and in England and Wales it can fall under the Sexual Offences Act 2003 or public-order legislation. Wikipedia notes that as of 2010 UK police treated arrests as “a last resort,” with response generally driven by complaints rather than proactive enforcement, but the legal exposure is real and is the main reason mainstream lifestyle clubs treat dogging as adjacent to, rather than part of, the on-premise scene.