One reason could be a sense of extreme intimacy. It can be seen as a very close physical connection between two people in the context of a loving relationship. It might also symbolize a complete trust in her partner.
There could be a change in her own perception. Maybe she initially misremembered or misinterpreted certain events, and after further reflection, she realizes her story was inaccurate. Also, external pressures like social stigma or the fear of being ostracized can make her change her story.
In some fictional stories, it could be seen as a sign of extreme intimacy. It might represent a level of trust between the characters where the woman feels so connected to the man that she desires this act as a way to deepen their bond on a physical and emotional level.
The story could approach it from a more symbolic angle. For instance, it could be about the woman wanting to fully embrace all aspects of her relationship with the man. It could be described in a way that emphasizes the significance of the act within the context of their relationship journey, like it's a new level of commitment or a deeper bond. And by using more refined language and not being overly graphic, it can avoid being vulgar.
Perhaps she doesn't like the way she is portrayed in the novel. If the author has depicted her in a negative or inaccurate light, that would be a valid reason for her not to want it.
There's also a chance that she was in a state of shock or confusion when she first told the story. As time passed and she had time to calm down and think clearly, she recognized that her story wasn't accurate. Additionally, if there were inaccuracies in the media coverage or misinformation spread around her initial story, it could have led her to recant.
One possible reason could be revenge. Even in death, she wanted the person who took her life to be punished. Another reason might be to protect others. If she thought the killer would target other people, naming the killer could be a way to stop that.
It might be common as it can be used as a plot device to show the depth of the woman's feelings for the man. If she desires this, it can imply that she is fully invested in the relationship and has no inhibitions when it comes to their sexual connection. This can add an element of passion and rawness to the story.
One possible reason could be out of frustration. If the son repeatedly engages in dangerous or extremely disobedient behavior, the mom might feel at her wits' end and consider spanking as a last - resort. But this is not a good solution.
It could also be an accidental occurrence. In a story with a touch of magic or the supernatural, a wife might be experimenting with some new - found magical powers or an old family heirloom with strange powers. And due to her inexperience or some unforeseen circumstances, her husband ends up being turned into a woman. This then sets off a chain of events as they both try to reverse the transformation while also learning about each other in new ways.
It could be due to various reasons like financial instability, not being ready for motherhood, or health concerns.