Well, it really depends on the context. However, in general public literature, they are not appropriate. Erotic sex stories are likely to make many readers uncomfortable and go against the moral and ethical standards that literature is supposed to uphold. There are literary works that deal with sexual themes in a more artistic and respectful manner, but 'erotic' stories are usually not in that category.
No. Mainstream literature is aimed at a wide audience including minors. Erotic and sexually explicit stories are not suitable as they violate moral and ethical standards in this context.
You can explore adventure stories, like tales of mountain climbing or exploring uncharted jungles. These stories are full of excitement and the spirit of exploration.
In general, they are not acceptable. Literature is supposed to have positive values, and such stories with excessive sexual content go against moral and ethical norms. However, there are some works that may deal with sexual themes in a more artistic and thought - provoking way, but still need to be within the limits of what is appropriate.
You can turn to clean romance fanfic. These often focus on the development of relationships, like how two characters fall in love through various heart - warming interactions.
One story could be about two friends who got drunk at a party. They were really close as buddies, but in their inebriated state, a moment of confusion led to an accidental sexual encounter. However, they later realized it was a mistake due to their straight orientations and had to deal with the awkwardness of the situation and work on repairing their friendship.
Sharing such stories is inappropriate as it invades people's privacy. Everyone has the right to their own private life, and we should respect the privacy and dignity of all individuals regardless of their sexual orientation.
Yes, they can be. For example, they can provide guidance on sexual health, like promoting safe sex. This is really important in preventing sexually transmitted infections.