diseases. Prostitutes were forced to register and were subjected to mandatory medical examinations. Registered prostitutes were handed a red card which was a sort of work permit. If they were found to be infected, their red card was taken and they were given a white card instead while they were prohibited from working and were only allowed to work when declared fit. After the French occupation the Dutch government stopped regulating prostitution, but during several decades slowly began to regulate prostitutes again in the same style as under the French occupation. Many scientists during the nineteenth century believed that sexual abstinence for men was unhealthy. In their eyes, it was unavoidable that a number of women had to sacrifice themselves to protect the rest of the women from the destruction of an even more revolting kind. The women who had to sacrifice themselves were supposed to be lower class. Prostitutes themselves, however, were still despised and portrayed as disgusting creatures. Lower-class people themselves detested prostitutes. Abolitionists outlaw the owning of brothels During the 19th century, sexual morals became stricter, and a counter movement arose against regulated prostitution. In the beginning, this movement consisted of wealthy orthodox-Protestant Christians, but it later got support from other movements like Catholics, socialists, feminists and progressive liberals. They attacked the idea that men could not abstain from sex. Clients were viewed as low, dirty lechers, and the clients were not the young unmarried men prostitution was meant for, but were often well-off middle-aged married men. They also attacked the mandatory medical examinations, which were deemed degrading and ineffective to stop the spread of venereal diseases. Many prostitutes lived in the brothels and were bound to the madams by debts to pay off expensive working clothes. Prostitutes were often sold among madams, were subjected to fines, and could only leave the brothel under supervision. Medical expenses were added to their debt. Brothel keepers throughout Europe sold women among each other. The abolitionist movement in the Netherlands was largely connected to the international abolitionist movement. The movement slowly gained more influence, and during the last decades of the nineteenth-century city governments slowly started to abolish regulated prostitution. At first, the abolitionist movement mainly targeted mandatory health checks for prostitutes, but when the movement became more successful the focus shifted towards the people who profited from prostitution. In 1911 living on the avails of prostitution and owning a