Dad: "Do you know what your brother said when he lost his virginity?" Son: "Dad, please don't!" Dad: "Exactly."
Do you think that's an appropriate joke to make?
Based on my experience telling it, I think it's a fine joke to make.
Telling jokes like that can cause harm to people who suffered abuse because they trivialize the severity of the act. If people who suffered abuse hear that joke, it may make them relive the experience in their mind. Would you tell that joke to a family member of yours who was sexually abused?