Every time Xandra drives past that lay-by, she wants to stop. Instead, she forces herself to carry on home, back to the safety of her living room, back to the warmth and the softness and the ability to close the curtains, fire up the laptop and google pictures of lorry cabs so she can better imagine what it would be like to be fucked inside one.

She doesn’t know quite what it is about lorry drivers. Or maybe it’s not even the drivers, maybe it’s just what they represent. Just thinking about parking her little Ford Fiesta in that lay-by amongst all those massive trucks and getting out to pee in the tired-looking concrete loo block makes her feel an equal mix of scared and turned on. It taps into so many things – exhibitionism, because the main road is so near, but also taboo – the sense that she’d have strayed somewhere she really shouldn’t be.

And so she dares herself, one winter afternoon, to stop on the way home from work. As her car slows to a halt, she’s thinking about all the women’s magazines she’s read over the years that warn of the dangers of trying to make your fantasies – even ones much more every day than hers – reality.

There’s nobody around, although there are several lorries parked up. She decides to check out the loo block – at least in there she’ll be able to indulge in some of her darker fantasies – of her cheek pushed up against the concrete as a short, muscular guy with a shaved head ploughs into her roughly from behind.

But as she opens the door of the block, she doesn’t expect to be confronted with the rear view of a guy at the urinal.

‘Oh christ,’ she says. ‘Sorry!’

And clearly, it isn’t often they encounter women around here because at the sound of her voice, the guy jerks and pees straight up the wall.m