Amsterdam has excellent public health STD/HIV services and offers free exams and testing to CSWs, and my understanding is that many CSWs get regularly tested and have low rates of HIV. I am unaware of possible different risks for male
vs female
vs transsexual CSWs, but as in most of the world, the chance of infection is higher in men who have sex with men. All in all the chance probably is low your partner was infected, but of course I have no way to judge for any particular CSW.