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

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For a mayor who will help make Londoners healthier, vote for Tessa Jowell

The surgeon, former Labour health minister and chairman of the London Health Commission, Ara Darzi, backs Tessa Jowell to be Labour's candidate for London mayor.

London’s mayor matters. As the world’s preeminent city, London possesses an enormous wealth of assets: energetic and enterprising people, successful businesses, a strong public sector, good infrastructure and more parks and green spaces than any other capital city.

Yet these aren’t put to work to promote the health of Londoners. Indeed, quite the opposite: right now, London faces a public health emergency.

More than a million Londoners still smoke tobacco, with 67 children lighting up for the first time every day. London’s air quality is silently killing us. We have the dirtiest air in Europe, causing more than 4,000 premature deaths every year.

Nearly four million Londoners are obese or overweight – and just 13% of us walk or cycle to school or work, despite half of us living close enough to do so. All Londoners should be ashamed that we have the highest rate of childhood obesity of any major global city.

It’s often been said that we don’t value our health until we lose it. As a cancer surgeon, I am certain that is true. And I know that London can do better. 

For that reason, twice in the past decade, I’ve led movements of Londoners working together to improve health and to improve the NHS. Healthcare for London gave our prescription for a better NHS in the capital. And Better Health for London showed how Londoners could be helped to better health, as well as better healthcare.

In my time championing health in London, I’ve never met a politician more committed to doing the right thing for Londoners’ health than Tessa Jowell. That’s why I’m backing her as Labour’s choice for mayor. We need a mayor who will deliver real change, and Tessa will be that mayor.  

When she invited me to discuss Better Health for London, she had the courage to commit to doing what is right, no matter how hard the politics. Above all, she wanted to know how many lives would be saved or improved, and what she could do to help.

In Tessa, I see extraordinary passion, boundless energy and unwavering determination to help others.

For all Londoners, the healthiest choice isn’t always easy and isn’t always obvious. Every day, we make hundreds of choices that affect our health – how we get to and from school or work, what we choose to eat, how we spend our free time.

As mayor, Tessa Jowell will help Londoners by making each of those individual decisions that bit easier. And in that difference is everything: making small changes individually will make a huge difference collectively.  

Tessa is committed to helping London’s children in their early years – just as she did in government by delivering Sure Start. Tessa will tackle London’s childhood obesity epidemic by getting children moving just as she did with the Olympics. Tessa will make London a walking city – helping all of us to healthier lifestyles.

And yes, she’s got the guts to make our parks and public places smoke free, helping adults to choose to stop smoking and preventing children from starting.   

The real test of leadership is not to dream up great ideas or make grand speeches. It is to build coalitions to make change happen. It is to deliver real improvements to daily life. Only Tessa has the track record of delivery – from the Olympics to Sure Start.   

Like many in our capital, I am a Londoner by choice. I am here because I believe that London is the greatest city in the world – and is bursting with potential to be even greater.

The Labour party now has a crucial choice to make. London needs Labour to choose Tessa, to give Londoners the chance to choose better health.