This column will change your life: don’t let your imaginary friends lead you astray

'When you conclude that you're having more or less sex than other people, remember those "others" exist, first and foremost, in your head,' says Oliver Burkeman

Sex-Pol: Essays, 1929-1934 by Wilhelm Reich – review

Can sexual satisfaction lead to revolution?Christopher Turner on genital utopia

The Sex Clinic; Trauma Doctors: TV review

Sam Wollaston: The Sex Clinic is probably a good thing – I'm just not sure I want to watch

How long after giving birth should I wait before having sex again?

Medical recommendations have changed over the years, but the best advice is still not to rush

Are pubic lice in danger of extinction?

Some doctors have suggested that modern pubic-hair grooming practices, such as the Brazilian wax, are destroying the natural habitat of Pthirus pubis

Take heart, men of negligible tone and tummies as hollow as your cheeks

Stuart Jeffries: Research involving 29 Latvian women in their fertile phase has revealed what women want – and it's good news for skinny guys

Making porn actors wear condoms is not the best way to protect us

Stoya: Measure B, a law requiring the use of condoms in adult movies in LA County, fixes a problem that doesn't exist. Our sex is safe

Sex: ‘Whatever you’re doing, double it’

Jon Henley catches up with two couples who tried regimes of consecutive sex, for 101 and 365 days respectively. Five years on, are they still, um, at it?

‘Reader, I shagged him …’

Should you turn to fiction or the sex manuals for advice and ideas? John Crace does the research so you don't need to

Dr Ruth Westheimer: My family values

The sex therapist talks about her family. Interview by Nick McGrath