Officially, the word they use for the genre is "visual novel". (adventure is a bit of a misnomer since you don't solve puzzles) It's kinda like those "choose your own adventure" books. Most of it is reading with the occasional choice to get onto the different story paths.
If you're interested in the genre, you may be interested in checking out this project. It's a project that's being developed by an international team of amateur game developers. (like a lot of projects here) It originally took roots on a 4chan subboard and the more committed members eventually split off and moved to their own development forums so they could start working in earnest without crazy folks dropping in and bogging things down all the time. Seeing where it was originally started and what the manga sketch the concept was based on was about (dating girls with disabilities), most people who followed it initially expected it to be an extremely demented fetish-fest where the player was invited to exploit the various (disabled) main cast members, but when Act 1 was released as a demo it actually turned out to be a pretty well-written VN that took a very respectful approach to handling the somewhat delicate subject matter.
The project was always intended to eventually have adult scenes in there (although Act1 doesn't contain any), so the developers are currently facing the very issue you're writing about...how to keep the adult scenes tasteful and in-character.
If you're interested in the genre, you may be interested in checking out this project. It's a project that's being developed by an international team of amateur game developers. (like a lot of projects here) It originally took roots on a 4chan subboard and the more committed members eventually split off and moved to their own development forums so they could start working in earnest without crazy folks dropping in and bogging things down all the time. Seeing where it was originally started and what the manga sketch the concept was based on was about (dating girls with disabilities), most people who followed it initially expected it to be an extremely demented fetish-fest where the player was invited to exploit the various (disabled) main cast members, but when Act 1 was released as a demo it actually turned out to be a pretty well-written VN that took a very respectful approach to handling the somewhat delicate subject matter.
The project was always intended to eventually have adult scenes in there (although Act1 doesn't contain any), so the developers are currently facing the very issue you're writing about...how to keep the adult scenes tasteful and in-character.
