Teenagers are having sex younger than ever before. And as the age of first sexual intercourse drops, the number of teenagers getting sexually transmitted diseases is rising fast. Doctors are worried that most teenagers don't realise the risks they are running.
Panorama talks to young people just starting out on their sexual lives to find out what makes first sex so dangerous, and examines what can be done to stop teenagers taking such risks.

(Note: as Panorama is topical and likely to react to events in the news, its subject matter may change)