SVSSS actually has sex tho. Welp not as a tool for energy transfer.. Honestly if you poke around Danmei novels You'll find out more like this. I personally highly recommend Thousand Autumns. It's more political in the first half and romantic in the second, but you can watch the Donghua if the 2st half is hard for you.
I already watched Thousand Autumns animation. Haven't read the book tho
It's good. I highly recommend it. Generally if the novel has a movie/series/manhwa/audio adaptation it's probably actually good
I had a feeling this was a little similar to "The Scum Villain's Self-Saving System" except there's actual sex involved.