Namaikizakari has some in the later chapters.
Him&Him&Him, Sweet Lies Layered Like A Mille Feuille, and Writing Hell are just straight up p0rn w plot if ur into that.
I suggest looking into the josei/adult/smut tags rather than shoujo since shoujo is targeted towards young girls (so it’s more innocent)
Well there's namaikizakari but it's a manga not a manhwa it has a good art and it has what you're looking for , and if you read it already then I'd like to recommend a light novel called "Lucia" it has a manhwa but the art is not good and it didn't turn out good , the light novel has a similar theme to this manga and it's well written and it has a lot of R-18 scenes ;)
does anyone else know similar shoujo romances with this level of romance? like, kissing and sex (implied) and stuff lol.
i feel like the ones ive read are so innocent and childlike (even though they're adults). like, kissing and any sort of body contact is seen as the biggest deal :|