
Ah, I know this feeling... Ecchi and oppai everywhere I look in this genre... (well they want to sell it maybe?)
But if you like this kind of reincarnated manga without ecchi and stuff did you read http://www.mangago.zone/read-manga/tensei_shitara_slime_datta_ken/ ?
If not, then do it! It's has a really good story. And even if the MC is kinda op it does not have ecchi or the like. And the MC is really cute not only as a slime (and since he's genderless there isn't much to go with girls and stuff)

Do you know the manga about the girl getting reincarnated as a spider monster? That's a pretty great one too and zero ecchi since she's a spider and the manga is about her getting stronger.
I will give Re:Monster a try now since both of you recommend it :D (even if it seems to have sex scenes? Or is it just mentioned?)

well there aint really sex scenes but you will find out when you read it its not bad ε=ε=(ノ≧∇≦)ノ i still love the manga though

http://www.mangago.zone/read-manga/kumo_desu_ga_nani_ka/
It's this one :D I looked it up for you so you don't need to search (hopefully I got to you before you go onan endless search xD)
Most of the reincarnated mangas have ecchi genre in it and tbh it's getting old -.-
I'm so glad this guy (sword) doesn't have any impure thoughts towards this girl!! and even treated her like his own child ///