All armies have camp followers. Obama has MSNBC. Hooker's were more professional and had fewer diseases.
Actually, the term "hooker", meaning prostitute, appeared in print as early as 1845, and was unrelated to the General or his army.
The famous American Volunteer Group, (AVG), the Flying Tigers, had prostitutes flown in from India who were medically checked out and generally free of disease. When the U.S. joined the War and the AVG were inducted into the U.S. military, the acerbic General "Vinegar Joe" Stillwell stopped this practice, leading to increases in rates of infection and reduced availability of AVG aircrews.
What the Japanese (and to some extent Russians) did was different. The Japanese engaged in widespread and spontaneous rap of civilian women during combat. In garrison they kept female prisoners who were routinely gang raped, with whole platoons sharing a single woman. Only men who were medically cleared could use the comfort women, to prevent the spread of disease. Fear of rape of their female relatives and wives was used to motivate Japanese soldiers at the end. American servicemen were under strict orders not to molest Japanese women. I believe the penalty for rape was the firing squad. There is at least one report of a black Marine on Okinawa who was murdered by the family of a Japanese woman he had been molesting, and his body hidden in a cave. The family was afraid to request help from American authorities. The story went unreported for at least forty years after the War.
I recall when I was in Korea that a black soldier was found one morning back in Seoul, tied to a pole having been castrated and bleeding to death. The story going around was that he had raped a Korean woman and the family found him and meted out their own justice. That was in early ‘53.