Dogging, sex in public, watched by others is not illegal in itself but it can be if another person sees the act.
It is not against the law to be in an area with the purpose of meeting other people – however if it causes outrage to a witness, an offence may be committed
The offence is one of public indecency, or public nuisance but having sex in a public place is not against the law.
Last year saw increased reports that people were meeting to watch each other having sex in cars
Criminal offences under the Sexual Offence Act 2003 include engaging in sexual activity in a public lavatory, while exposure with intent to cause alarm or distress and voyeurism on people engaged in a private act without their consent are also criminal offences.