There’s a particularly boorish story about Winston Churchill asking a socialite whether she would sleep with him for five million pounds. It’s claimed that when she said yes, he asked if she would do it for five pounds:

Socialite: "Mr. Churchill, what kind of woman do you think I am?!"

Churchill: "Madam, we've already established that. Now we are haggling about the price.”

As illustrations of sexual double standards go, it’s a pretty unpleasant one. Nonetheless, I’ve started to wonder whether Churchill had a point. If sex has already been established as a means of exchange, why shouldn’t the buyer try to get the best deal he can?

For instance, if instead of paying for sex a landlord would rather receive sexual favours from a tenant living rent-free, would that really be so bad? Well, yes, actually it would, at least according to recent reports of landlords making this very offer. Apparently, this is an appalling example of the current housing market allowing predatory men to exploit the vulnerable.

Only if this is the case, why is paying for sex not viewed with the same horror? It’s the same marketplace, the same bodies, the same needs. All sex for rent does is cut out the symbolic means of exchange in the middle. Yet far from decrying the exchange of sex for money, supposedly progressive organisations such as Amnesty International and the NUS, in addition to mainstream political parties such as the Liberal Democrats and the Greens, are pushing to liberalise attitudes towards the purchase of sex. Why are these two things seen so differently?

True, live-in work carries with it particular risks and uncertainties, but do any of us feel the same qualms about housekeepers or nannies getting to live rent-free? And aren’t many of us doing jobs we’d rather not do, only a pay check or two away from eviction? So why should sex for rent be seen as especially problematic?

If it’s to do with the fact that it’s sex and not, say, cleaning or childcare, shouldn’t we be able to pinpoint why this is? And yet few are willing to do so, silenced by the thought-terminating clichés – “sex work is work”, “my body, my choice” – that have come to dominate the left’s approach to sex and gender.

I’d go so far as to suggest the mainstream left has no real right to be shocked about sex for rent. After all, it’s only the logical conclusion of a pseudo-feminist politics which refuses to engage fully with power and labour redistribution, choosing instead to talk in circles about the right of individuals to do whatever they like with their own bodies while bypassing any analysis of why one group seeks to control the sexual and reproductive lives of another. It’s politics for the unthinking and the privileged, yet it appears we can all afford to be unthinking and privileged when it’s only the bodies of women at stake.

“My body, my choice”, a perfectly appropriate slogan when used to mean only a pregnant woman should be able to make decisions about her pregnancy, has been expanded ad absurdum. Yet the point about abortion is that the only alternative to it is the work of pregnancy; there’s no possible third option, whereby the already-pregnant individual gets to go through neither. The same is not true of sex work or poverty. It is possible for there to be alternatives to exploitation or destitution. That for many women there are currently none is not least down to a politics that values unlimited sexual freedom for all – an impossibility – over a fairer redistribution of limited choices for everyone.

If we regard women as full, equal human beings, then we cannot have a world in which there are no limits placed on men’s access to female sexual and/or reproductive labour. “Sex work is work” and “my body, my choice” simply don’t cut it when it comes to deciding where to draw the line. We should all face restrictions on what we can do with our own bodies, just as we should all have duties of care towards the bodies of others. The problem with patriarchy is not that it prevents women from having the same physical freedoms as men due to some inexplicable, knee-jerk “woman-phobia” –it’s that it shifts most of the necessary physical restrictions and duties attached to reproduction and care onto women, leaving men with the belief that liberation means no one ever saying “no” to you.

Such a belief – at heart pro-capitalist and anti-feminist – has seeped into supposedly pro-woman, left-wing thought and activism, yet anyone who points out the absurdity of it is treated to a Victorian asylum-style diagnosis of prudery and whorephobia. To claim, on the one hand, that one is anti-austerity and anti-neoliberal, while insisting, on the other, that no woman is without means as long as she has orifices to penetrate, is not progressive. On the contrary, it’s ultra-conservative. It shifts the baseline of our understanding of need and it does so dishonestly, masking coercion by repackaging it as free choice.

If anything is for sale – any body part, any experience, any relationship – then the poorest will be stripped bare. If you accept the principle that there is nothing wrong with buying sex – or ova or breastmilk or babies – how do you ensure supply can meet demand? Only by making sure there are always enough women with no other options. There is no other way. There are not enough female bodies to meet male sexual and reproductive demands without any form of coercion; that’s why patriarchy, with all its complex systems of reward and punishment, exists in the first place.

If sex work is work, poverty is necessary. The alternative to patriarchy isn’t a world in which everyone gets to be a de-facto patriarch, free to make whatever sexual and reproductive choices they want, safe in the knowledge that there will always be willing bodies to meet their demands. The postmodern fantasy that an underclass of coerced, poverty-stricken females can be replaced by an underclass of willing, always-up-for-it, cisgendered females, while charming in its naivety, remains just that: a fantasy.

If you think it’s OK to pay for sex with money but not with accommodation, perhaps you should consider what kind of person you are.

Because I’d say we’ve already established that. Now we are haggling about the price.