This is an extremely unethical and inappropriate topic in most cultures and ethical systems. However, in some ancient or very specific and controversial literary works, there might be some complex and often condemned storylines touching on this. But it is not something to be advocated or casually explored.
Ethically, it is unacceptable. It goes against the principles of loyalty within a family structure. The relationship between a brother and his wife is a sacred one in terms of family ties. Any form of sexual relationship here not only betrays the brother but also disrupts the normal family order and can lead to a cascade of negative emotions like jealousy, anger, and sadness among family members.
In most cultures, it is completely unethical. Incestuous or inappropriate relationships within the family structure, such as with a brother's wife, are considered taboo. These cultural norms are in place to maintain family harmony, genetic integrity, and uphold moral values.
Sharing such stories is inappropriate and unethical as it involves violating the privacy and moral boundaries of others. We should focus on positive, healthy and ethical topics.
In most ethical and moral frameworks, this is completely unethical. It goes against the principles of loyalty and commitment within a marriage. In society, marriage is often seen as a bond between two individuals, and such an act would be a serious violation of that trust.
Well, in modern Western cultures, this is an extremely taboo topic. Incestuous relationships like this are not only against the law in many places but also go against the general moral fabric of society. There are very few, if any, positive cultural connotations to such a theme.
In real life, biological sex change through natural means for an adult is not possible in the sense of a sudden, magical transformation like in some fictional stories. However, transgender individuals can undergo medical and surgical procedures over a period of time to change their gender presentation. But this is a complex process involving psychological evaluation, hormonal therapy, and surgeries, which is different from the idea of a sudden 'wife change sex' as might be misconstrued from the title.
The following are some recommendations from ancient novels about his brother's wife:
1. " Demon King My Wife ": This novel tells the story of the protagonist reincarnating and marrying a beautiful wife. He loves his wife deeply and his feelings are pure. There are no other plots.
2. " Humble Scholar: Marry Three Wives and Concubines at the Beginning ": This was a novel that traveled through ancient times. The protagonist, Song Tianming, married three wives and concubines according to the imperial court's decree. The story showed the deep feelings between brothers.
3. " Demon of Breaking the Marriage at the Beginning ": This novel is about the deep friendship between brothers. The elder brother finds a wife for the younger brother, and the younger brother marries in the name of the elder brother. The plot is similar to the situation you described.
Please note that the novels recommended above may only be part of the relevant results. There may be other ancient novels that are suitable for you.
Often it ends in disaster. The husband might find out and there would be a huge rift in the family. There could be divorces, estrangement between family members, and a lot of anger and pain.
No, it is completely unethical. Having sex with a friend's wife violates the basic principles of friendship, loyalty, and respect. It can cause great harm to the friend, his family, and the relationship between you and your friend.