Julia Margo, senior research fellow for the IPPR, said there had been a dramatic fall in the last 50 years in the average age people first had sex.

• 另外，感染衣原体疾病及疱疹等性病的青少年增多。在15岁的青少年中，有三分之一承认他们在发生性行为时没有使用安全套。