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Amsterdam's infamous Red Light District is a diverse, multicultural and multi-kink hub of sex workers.
You can pretty much find every single type of woman or man to service your mildest or wildest desires.
While these workers will have multiple customers every day, they can't compare to the district's oldest team.
Twin sisters Louise and Martine Fokken have more than a century of experience between them and were crowned with the title of the District's 'oldest window girls' back in 2012 before their retirement.
They've had a documentary made about them called Meet the Fokkens and also had a book detailing their incredible lives.
It probably wouldn't be a surprise to some, however these sisters in their late 70s have serviced more than 335,000 clients in their lengthy careers.
Speaking to the Guardian, Louise explained how she got into the sex industry.
"I was beaten on to the streets by my husband in my early 20s," she said. "He told me unless I earned money for him he would leave me, and I had children and loved him, so I had to do it."
Martine was giving birth to her first child when she was told her twin sister was working in the famous windows.
She didn't realise Louise was in such a tight financial position, so she offered to help.
Louise added: "Later on they needed a cleaner in the brothel and Martine took the job and the men asked her for business. So we started doing threesomes, and that was how we ended up working in the same house [window brothel] together."
They said it was much easier being in the sex industry together because they could keep each other safe.
Martine recalled one experience to the BBC when she told a client to take off his clothes and suspected something was up. It wasn't until she felt under the pillow that she discovered the bloke had hidden a massive knife.
But how does one keep attracting clients when there is such high competition in the District?
Martine decided to specialise in bondage for older men and targeted those who have a penchant for pain with pleasure.
"We know the tricks, we know what they want. We know how to talk to them and we know how to make them laugh too," she told the Beeb.
The pair of them have few regrets in their life and have fond memories of their career in the sex industry.
"This is what we know. If we didn't do hooking then what would we do? This is our life," Martine said.
They are both now retired, with Louise tapping out first due to arthritis and Martine following not long after.
Louise told the Guardian that the industry hasn't become better as time has rolled on.
"The whole family used to live off your earnings and now the tax office comes up with crazy amounts you have to pay," she said.
"It is better for the pimps and the foreigners, but not the Dutch girls. The vultures came in 2000. Organised criminals."
Martine added to the BBC: "The boys are different now, they drink too much, they're fat and they don't respect you. They should be on their bikes like Dutch boys, not just drinking all the time."
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