No, it is not ethical. Sharing stories that involve sexual content in the context of a party is inappropriate and disrespectful. It objectifies people and goes against basic moral principles of respect and privacy.
Such stories often involve explicit and graphic sexual content with a focus on certain sexual acts. They are usually considered inappropriate and vulgar.
We should avoid discussing sexual content. Instead, we can talk about topics like body positivity for plus - size women in a general and respectful way.