I guess it's not very common but I love them, I recommend Halls of the Pale Widow, although it's a bit difficult to unlock things and has some map bugs it's still a great game.
Not a fan of the porn + horror. Although I remember a japanese game with a gameboy graphics that I liked. Abaddon princess of decay I think was its name
Not interested. Horror films can bring a couple together, and the same is obviously true for relying on one another to survive a horrible real life situation. Now & Then makes perfect use of this mechanism. Dissolution of society in a zombie apocalypse is a situation where you can really imagine a large group of women falling in love with a single reliable male, and naturally forming a harem. (This is the one aspect in which Now & Then is better than the structurally similar and otherwise superior Cosy Cafe.)
But beyond this mechanism and the occasional spice for a plot, I really don't need horror or gore or in fact any negativity in my porn, thank you very much.
I don't really like violence or horror combined with sex. But a well done post apocalypse VN where the violence and horror are mostly backdrop I can get into.