A review by amdame1
Zeroboxer by Fonda Lee

4.0

We have colonized Mars by genetic manipulation so that people can survive the very different climate there. We also have colonies on the moons and a sport called zeroboxing has become a big thing (Boxing in zero gravity). Carr Luka is from Toronto and is an exceptional zeroboxer. He becomes a professional and moves to one of the moons to fight and train. Winning a big fight makes him a celebrity and he gets a contract that sets out to make him even more well-known. When Carr finds out a big secret about his past, he keeps it to himself because of the impact it will have on his life and career.

Interesting exploration of inter-racial (species?) dating and interactions between Earthlings and Martians.
A little bit of drinking
Romance with several sexual situations and a lot of innuendo.
Lots of violence. Boxing is not a gentle sport.