Shinko is a Japanese sex worker that Changez employs when it becomes clear that Jamila will never go to bed with him. Their relationship persists for the entirety of the novel and though Changez continues to pay Shinko for her services, they do seem to feel genuine respect and affection for each other. Jamila supports Changez's decision to employ Shinko.
Shinko Character Timeline in The Buddha of Suburbia
The timeline below shows where the character Shinko appears in The Buddha of Suburbia. The colored dots and icons indicate which themes are associated with that appearance.
Part 1, Chapter 7
...and then reemerges, a middle-aged Japanese woman behind him. Changez happily explains that the woman, Shinko, isn't a prostitute, she's a friend, and he can love both her and Jamila. (full context)
Part 2, Chapter 9
Part 2, Chapter 12
Part 2, Chapter 14
Part 2, Chapter 18
...oblige unhappily and wonders if he should intervene. When Jamila asks if Changez has seen Shinko recently, Changez explains that Karim stirred him up by implying that Jamila is a lesbian.... (full context)