Dogging is a British English euphemism for engaging in sexual acts in a public or semi-public place or watching others doing so. There may be more than two participants; both group sex and gang banging can be included. As observation is encouraged, voyeurism and exhibitionism are closely associated with dogging. The two sets of people involved often meet either randomly or (increasingly) arrange to meet up beforehand over the Internet.
Dogging started in the later part of the 20th century, in the UK, with locations mainly being public car parks and lay-bys (usually on quiet country roads) with activity normally taking place after dark. Doggers would usually leave their interior lights on in their cars so that other doggers would know that they too were doggers. Some would flash their headlights at other cars or flick the interior light on-and-off briefly. These are the most common signs to show that one is a dogger, and are also the signs used by gay men who use lay-bys as cruising grounds for sexual activity. Many dogging locations are used by both straight doggers and gay men.
In September 2003 the BBC reported on the 'new' dogging craze. They cited the Internet and text messaging as very common ways of organising meetings. The original definition of dogging – and which is still a closely related activity – is spying on couples having sex in a car or other public place.