Yes, there are many Sasusaku married fanfictions that focus on their relationship in a non - smutty way. These often explore their daily lives, how they support each other, and their growth as a couple. You can find them on fanfiction websites by using appropriate filters to exclude mature content.
Well, a common theme is their friendship within the marriage. They were friends before getting married, and stories might focus on how that friendship continues to strengthen their relationship. Also, cultural differences can be a theme. Given their different backgrounds in the Naruto universe, how they navigate those differences in their married life is an interesting aspect. For instance, Sasuke's clan traditions and Sakura's more normal village life upbringing. There are also stories that focus on their travels together, exploring new places in the Naruto world as a married couple.
Anti Sasusaku fanfic focuses on going against the Sasusaku relationship. So, while regular Sasusaku fanfic might show the growth and love between Sasuke and Sakura, anti ones would show the opposite. For example, they could show Sasuke constantly rejecting Sakura or having a negative view of her.
The popularity also stems from the fact that Sasuke and Sakura are well - known characters from a very popular anime/manga. People are already invested in them, so they are eager to read fictions that focus on their relationship, whether it's about their love, friendship, or their journey together.
Smut fiction is a type of fictional writing that contains sexually explicit content. It often focuses on sexual encounters, relationships, and desires. However, it is considered a form of adult - oriented literature and may not be suitable for all audiences.