HOW much do sexual habits vary between countries? A great deal, according to a study of 14,000 people in 48 countries. The survey asked respondents to consider seven questions related to sex. Some questions were factual: how many sexual partners have you had in the past year and how many one-night stands have you had? Other questions were about attitudes to sex: is sex without love acceptable, or sex with casual partners? From the answers, the researchers compiled an index of promiscuity for respondents from each country. The result appears to show that Finns and other Europeans are the most promiscuous, whereas respondents from more conservative countries, such as Bangladesh and Zimbabwe, are less promiscuous. Around the world men and women vary in their attitudes to casual sex. Men are more likely to seek it out in their late twenties. Women wait until their thirties when the chances of a casual encounter resulting in pregnancy are less.