Why is it not compulsory for prostitutes to be tested?

In the Netherlands there is no mandatory testing for prostitutes. It is up to the individual to decide whether or not to be tested for STIs. This is a basic right and therefore also applies to prostitutes (and their clients).

Advice

The advice for clients of prostitutes is to have a general STI test once a year.
The advice for prostitutes is to have a general STI test four times a year.
This way, both sides can keep their sexual health in check. If you have contracted an STI, you can generally be treated intime.

Condom

The safest way of having sex with a prostitute is to always use a condom when you have vaginal sex and during a blow job, and get tested once a year, irrespective of whether the prostitute has been tested.

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