I find the hate towards this hilarious. Ethical sluts are based. I like that the manga explores the conflicted feelings this evokes in mc and how he slowly overcomes his prejudice.
For now the manga has only depicted consensual sexual encounters, (except that one time dude went raw), it would be interesting to see how the female characters handle guys that push them farther than they want to (an unfortunately common experience for women) although this would make the tone a whole lot darker. I expect there to be some sort of trauma backstory at some point and that will probably make or break this manga for me (most likely the latter knowing japan).