Two things:
Firstly, we don’t need to know about Ms Dick’s personal arrangements. Whoever she decides to take up with and what sort of relationship it she is in is entirely a matter for her. Quite why she needs to tell everybody is a mystery. But since she’s mentioned it she might like to consider whether her relationship is very wise. Imagine at annual appraisement time her partner’s Chief Inspector considering giving her a bad report. Is he going to be influenced by the fact that his subordinate will be getting into bed with the police commissioner that night?
Secondly, the police force does not have to represent the community it serves. If it did, it would have among its number a smattering of burglars, rapists, child molesters, fraudsters, murderers and illegal immigrants. Its function is the prevention and detection of crime. Quite who does that simply depends on their ability to feel collars, not whether they are black or white or whether they bowl from the gasworks end or have had their genitals reorganised.