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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Like it or hate it, it doesn't matter: Brexit is happening, and we've got to make a success of it

It's time to stop complaining and start campaigning, says Stella Creasy.

A shortage of Marmite, arguments over exporting jam and angry Belgians. And that’s just this month.  As the Canadian trade deal stalls, and the government decides which cottage industry its will pick next as saviour for the nation, the British people are still no clearer getting an answer to what Brexit actually means. And they are also no clearer as to how they can have a say in how that question is answered.

To date there have been three stages to Brexit. The first was ideological: an ever-rising euroscepticism, rooted in a feeling that the costs the compromises working with others require were not comparable to the benefits. It oozed out, almost unnoticed, from its dormant home deep in the Labour left and the Tory right, stoked by Ukip to devastating effect.

The second stage was the campaign of that referendum itself: a focus on immigration over-riding a wider debate about free trade, and underpinned by the tempting and vague claim that, in an unstable, unfair world, control could be taken back. With any deal dependent on the agreement of twenty eight other countries, it has already proved a hollow victory.

For the last few months, these consequences of these two stages have dominated discussion, generating heat, but not light about what happens next. Neither has anything helped to bring back together those who feel their lives are increasingly at the mercy of a political and economic elite and those who fear Britain is retreating from being a world leader to a back water.

Little wonder the analogy most commonly and easily reached for by commentators has been that of a divorce. They speculate our coming separation from our EU partners is going to be messy, combative and rancorous. Trash talk from some - including those in charge of negotiating -  further feeds this perception. That’s why it is time for all sides to push onto Brexit part three: the practical stage. How and when is it actually going to happen?

A more constructive framework to use than marriage is one of a changing business, rather than a changing relationship. Whatever the solid economic benefits of EU membership, the British people decided the social and democratic costs had become too great. So now we must adapt.

Brexit should be as much about innovating in what we make and create as it is about seeking to renew our trading deals with the world. New products must be sought alongside new markets. This doesn’t have to mean cutting corners or cutting jobs, but it does mean being prepared to learn new skills and invest in helping those in industries that are struggling to make this leap to move on. The UK has an incredible and varied set of services and products to offer the world, but will need to focus on what we do well and uniquely here to thrive. This is easier said than done, but can also offer hope. Specialising and skilling up also means we can resist those who want us to jettison hard-won environmental and social protections as an alternative. 

Most accept such a transition will take time. But what is contested is that it will require openness. However, handing the public a done deal - however well mediated - will do little to address the division within our country. Ensuring the best deal in a way that can garner the public support it needs to work requires strong feedback channels. That is why transparency about the government's plans for Brexit is so important. Of course, a balance needs to be struck with the need to protect negotiating positions, but scrutiny by parliament- and by extension the public- will be vital. With so many differing factors at stake and choices to be made, MPs have to be able and willing to bring their constituents into the discussion not just about what Brexit actually entails, but also what kind of country Britain will be during and after the result - and their role in making it happen. 

Those who want to claim the engagement of parliament and the public undermines the referendum result are still in stages one and two of this debate, looking for someone to blame for past injustices, not building a better future for all. Our Marmite may be safe for the moment, but Brexit can’t remain a love it or hate it phenomenon. It’s time for everyone to get practical.