Responses
Mature doesn't have to mean sex/hentai i have many mangas with the gerne Mature but there were no sex.
And to answer your question, we didn't get to see real sex yet. ; )
Mature can mean various things, but here I think it is because there is a lot of prostitute, and pretty harsh scene but no, no real sex scene yet... Also cause it's pretty a violent manga maybe ...
In the genre of the manga it puts "Mature" , this means there is hentai (hetero sex) between the protagonists or someone else?