I'd question if Food Wars/Soma really has sexual themes, especially if you're referring to the foodgasms, which aren't real, first off, they're purely imaginary in terms of what's actually happening. The closest we get is maybe from season 3-4 onward with some of Erina's family and such, but even that's more meant to be bizarre and such, not sexually arousing, even if some could take it that way.
And having not seen Kill La Kill, but being somewhat familiar with Trigger's general style, I'm skeptical if that is intended to be sexual or encouraging something negative in nature entirely, because there's a lot of subtext with KLK supposedly with what message is being conveyed, kind of like Brand New Animal that came out recently (still not on U.S. Netflix, to my knowledge) with regards to identity and belonging, among other things
Sometimes a series can have mature content without it being something that is corrupting, but more thought-provoking, like Beastars, which doesn't show any nudity, it's more used as a plot device for character development, nothing really happens as I recall onscreen, any sex and stuff is offscreen, similar to brutal violence.
Just from my top 5~ new series from last year, there's My Roommate Is a Cat, that's pretty neutral in terms of sex and violence.
Fairy Gone is military drama, but the violence isn't overdone, it's an interesting piece on the horrors of war in a society that's trying to recover from it and even some notions about coexisting with nature.
And my top recommendation is Astra Lost in Space, which doesn't really have either of the content you're worried about (certainly not demons, it's sci fi) and is an interesting look at dystopian society with a new twist, plus an adventure plot
As for Winter 2020, only Nekopara really works, the others too violent or sexual for general audiences, though Spring 2020 has been lacking, unfortunately
