A mattress in the woods.

Dogging is British slang for people engaging in outdoor sexual acts in secluded public areas. Lay-bys, woods and picnic spots around the UK often double as dogging locations once darkness falls. Carried out under the cover of night, the practice generally involves sexual acts between people who are complete strangers. Increasingly though, participants arrange to meet at a dogging site via the internet or through social-networking media. Dogging has no rules; it may take place between couples or in groups. Some like to watch, some are exhibitionists, others just like to talk, but most are there for the thrill of having sex with strangers.