Aidka
Hey, I know most people don't like this, but seriously, not everyone is a good guy. If it was me, having reincarnated several times, almost everything will become monotonous and boring, only by doing something different, out of bounds or taboo will I be able to enjoy my reincarnation. I am not a kind/good person who saves people for nothing who can't even repay me in their entire life, so I don't mind doing this without having any mental burden. This type of situation is pretty normal and you can easily find it in the red district. If you don't like it then you can skip reading these 18+ scenes but you shouldn't tell the author what to do. Good or bad, it's not up to you to decide because no one truly cares about you. You might as well become a saint if you keep preaching how bad it is.
its difficult for people of modern ethics to accept this. you should read books about medival period. you can see that whoring in poor commoner society was common and was not disdained by people of lower society. why? you should do something for the survival and feed your family. it was difficult for them to even get a warm place. so work like those were pretty common.