Britons are having less but more varied sex, according to the third installment of a large-scale national survey published today by the Lancet medical journal.

Compared with results from the first and second surveys, which were based on interviews conducted in 1990-91 and 1999-2001 respectively, the likelihood of respondents saying they had sex in the past four weeks (a tried-and-tested research question) decreased significantly. In part, this reflects changes in demographics over the period, for example more single person households. Read more