It's not appropriate at all. These types of stories often violate moral and ethical boundaries. We should promote healthy and equal relationships based on respect and love, rather than being interested in such improper content.
This is completely unacceptable. In a healthy society, we should uphold values that respect the dignity and privacy of others. This kind of story not only goes against good taste but may also have a negative impact on one's perception of relationships. Instead, we should look for positive relationship models in literature and media.