Well, it depends. If these true sex stories are used to shame or expose someone without their permission, then no, it's not ethical at all. But if they are told in a more general sense, like in a discussion about sexual experiences to help others understand different aspects of human sexuality in a respectful and non - identifying way, it might be more acceptable. We have to think about the feelings and rights of the people in those stories.
In general, sharing sex - related true stories can be a complex matter in terms of ethics. On one hand, if the stories are shared without the consent of the parties involved, it is clearly unethical as it violates their privacy. However, if they are anonymized and shared in an appropriate context, such as in a sexual health education or a research study about relationships and sexuality, it could have some value. But overall, great care must be taken to ensure no harm is done.
Sharing true sex stories is often not ethical. People's sexual experiences are very personal. Even if the names are changed, the details can still be recognizable to those who know the individuals involved. It can lead to embarrassment, damage to reputations, and harm to relationships. There are very few situations where it would be okay, like if the person sharing their own story in a therapeutic or educational setting where they have complete control over how it's presented and who hears it.