Auschwitz Brothels. Just a myth or cruel reality?

In 1943, block 24a that housed male inmates, was turned into an onsite brothel. It was seen as the most ridiculous idea by some SS leaders, but the head of Auschwitz decided that it would be used as a reward to the 'hard working' prisoners. (non Jewish of course). The women were taken from the camps, not from the Jewish race. They were treated well with enough food, water and shelter, as well as walks, which other prisoners were not provided with. 

this is block 24a, which was used as the brothel for 2 years, 1943-1945
(taken from google images)

Inside block 24a

Only 'special value prisoners' were allowed to visit this brothel, and they had to obtain vouchers from SS guards who would then evaluate and decide whether they were good enough or hard working enough to be allowed into it. Usually the types of prisoners that gained access to these vouchers were skilled craftsmen. E.g. Chefs to the SS guards, hairdressers, fire brigade members. 

From my research, people that survived during this time do not wish or want to speak of what happened in this brothel.