A police fetish is a sexual fetish in which either a man or a woman enjoys dressing in a police uniform, or someone derives sexual pleasure from viewing others dressed in this manner. The uniform may be realistic, or made sexier by for example PVC clothing, a miniskirt, stockings, fishnet tights or high heels.
Sometimes, someone may wear such a uniform in a scene where they arrest, handcuff and cage or interrogate someone. There could be violence, regarded as "police brutality". This may add a sense of authenticity to the game play.