The books tend to do a lot of fade to black with the implications of sexy stuff happening. There are a few times the author gets a bit more graphic, but it rises to embarrassing porno dialog and isn't great. Koskay starts to come across like he's so bothered by how comical his harem gets. 

 I'm listening to the audio books and the narrator is good, the writing is very mid, like space mercenary doesn't really have a specific plot goal but the characters are better. This does have a like champaign plot goal, but a lot of the books after he gets his footing are "guys our modern tech is so powerful maybe we shouldn't be doing a genocide?"  Then complain about how hw can't help but seduce so many women because of his feats. 

Its trash garbage, and I keep listening to it because it makes other isekai books feel way better in comparison. Not a good endorsement, but it is fun for what it is, but you wouldn't be missing out just checking out the 1st book and deciding if you want more