Belle de Jour writer Brooke Magnanti. Photo by REX Features
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Brooke Magnanti's The Sex Myth review: How Belle de Jour got her figures wrong

Brooke Magnanti's skewering of others' bad stats is excellent. It's a shame she isn't blameless herself.

Brooke Magnanti is one of our best-known female scientists – albeit not for her research. Accounts of her time as a high-end sex worker, published under the nom de plume Belle de Jour, were made into a glossy TV series fronted by Billie Piper. Her new book, The Sex Myth, attempts to join her two lines of work, cutting a useful, Ben Goldacre-ish furrow into areas where sexuality meets public policy.

Magnanti pulls apart the canards in the government’s review into the “sexualisation of childhood”, led by the Mothers’ Union president, Reg Bailey. She zaps away a widely cited claim that lap-dancing clubs in Camden led to a 50 per cent rise in rape. At her hands, zombie statistics get a brutal comeuppance. A chapter on the wild exaggeration of sex trafficking builds on work by the Guardian’s Nick Davies.
 
These are all fascinating but the book does not quite hang together. This is principally because, as well as a dissection of bad social science, it is a pro-prostitution-and-porn polemic. Even if you are sympathetic to her arguments about the weak evidence for the harm they do – and I am – melding these two approaches makes for one unsatisfactory encounter.
 
First, because she introduces an irritating Aunt Sally: the feminists. Magnanti cheerfully generalises about them in exactly the way she claims they do about sex workers. The feminists hate porn. The feminists hate prostitution. The missing word is “some”. (Incidentally, Magnanti refuses to talk to me, citing an online argument I can neither find nor remember.)
 
Her lack of nuance in engaging with critics and unwillingness to see her own viewpoint as anything other than objective are weaknesses. She is upset that the Secret Diary of a Call Girl TV series was “accused of glamourising sex work”. Her distress is baffling: it’s bleedin’ obvious that it did. It was a glossy star vehicle.
 
The most important flaw, however, is that Magnanti is not as careful in deploying research to advance her arguments as she is in debunking the statistical sleight of hand of others – particularly on prostitution. The Magnanti who debunks Bailey would sneeringly gut the Brooke who writes about sex workers.
 
Take the centrepiece of her argument on prostitution: a pair of studies of sex workers, the first by Suzanne Jenkins of Keele University and the second by Eaves, a charity, and London South Bank University. The second study was the more negative of the two about the effects of sex work on prostitutes, finding physical, mental or sexual health problems in lots of cases. Magnanti criticises this because “the sample they’ve recruited is not representative of UK sex workers overall”. It focuses too heavily on streetwalkers, a minority who have “more chaotic” lives.
 
“As a former statistician dealing with population-based data,” she says, “I know that one of the most important criteria for an acceptable study is to make sure the sampled population reflects the status of the population as a whole. If this is not done, the results are not reliable.” 
 
The Keele research, on the other hand, is commended for “turn[ing] almost everything we know about sex work on its head”: a third of the respondents had degrees, 85 per cent of the women were aged 26 or older and a top answer to “How long do you plan to do escort work for?” was “I have no plans to stop”. Magnanti praises it for using “not simply street-based women, either, but women, men and transgendered sex workers in all areas of the business”.
 
Case closed. Except the word used to describe the sex workers in the Keele study was “escorts”, which usually means those who advertise themselves on the web or with agencies. Not streetwalkers. A look at the original study reveals that Jenkins confined her research “to sex workers who advertise their sexual services via websites as escorts”.
 
The Eaves research may well be skewed in favour of the experiences of streetwalkers. But the Keele study is skewed against them. Neither is representative of the industry as a whole, yet Magnanti mysteriously claims the one that supports her views is.
 
The error rather bulldozes her argument and undermines the book. If you’re going to be a smart arse – and she is, relentlessly – make sure you’re right. Magnanti, although fascinating on the misuse of statistics generally, does seem to have come a cropper when using them to push her own agenda.

Helen Lewis is deputy editor of the New Statesman. She has presented BBC Radio 4’s Week in Westminster and is a regular panellist on BBC1’s Sunday Politics.

This article first appeared in the 30 April 2012 issue of the New Statesman, The puppet master

#Match4Lara
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#Match4Lara: Lara has found her match, but the search for mixed-race donors isn't over

A UK blood cancer charity has seen an "unprecedented spike" in donors from mixed race and ethnic minority backgrounds since the campaign started. 

Lara Casalotti, the 24-year-old known round the world for her family's race to find her a stem cell donor, has found her match. As long as all goes ahead as planned, she will undergo a transplant in March.

Casalotti was diagnosed with acute myeloid leukaemia in December, and doctors predicted that she would need a stem cell transplant by April. As I wrote a few weeks ago, her Thai-Italian heritage was a stumbling block, both thanks to biology (successful donors tend to fit your racial profile), and the fact that mixed-race people only make up around 3 per cent of international stem cell registries. The number of non-mixed minorities is also relatively low. 

That's why Casalotti's family launched a high profile campaign in the US, Thailand, Italy and the US to encourage more people - especially those from mixed or minority backgrounds - to register. It worked: the family estimates that upwards of 20,000 people have signed up through the campaign in less than a month.

Anthony Nolan, the blood cancer charity, also reported an "unprecedented spike" of donors from black, Asian, ethcnic minority or mixed race backgrounds. At certain points in the campaign over half of those signing up were from these groups, the highest proportion ever seen by the charity. 

Interestingly, it's not particularly likely that the campaign found Casalotti her match. Patient confidentiality regulations protect the nationality and identity of the donor, but Emily Rosselli from Anthony Nolan tells me that most patients don't find their donors through individual campaigns: 

 It’s usually unlikely that an individual finds their own match through their own campaign purely because there are tens of thousands of tissue types out there and hundreds of people around the world joining donor registers every day (which currently stand at 26 million).

Though we can't know for sure, it's more likely that Casalotti's campaign will help scores of people from these backgrounds in future, as it has (and may continue to) increased donations from much-needed groups. To that end, the Match4Lara campaign is continuing: the family has said that drives and events over the next few weeks will go ahead. 

You can sign up to the registry in your country via the Match4Lara website here.

Barbara Speed is a technology and digital culture writer at the New Statesman and a staff writer at CityMetric.