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[Perspectives] Making sex add up

Sex research is notoriously problematic, not least because sex is shrouded in taboo and stigma. So it’s interesting to read a book that seeks to tell “the real story about sex in modern society”. In Sex by Numbers, David Spiegelhalter draws on the findings of the pioneering British National Survey of Sexual Attitudes and Lifestyles (NATSAL), alongside other sources, to give a valuable overview of sex statistics—on everything from how often people have sex, to the changing profile of same-sex experiences, to the average energy expenditure during sex, to the median ejaculation time after vaginal penetration, to the rate of teenage pregnancy, and much more.