I use to have sex with my sister. It stopped being fun when I found out she was adopted.
What would make you say something like that about your sister?
It was just a simple joke.
Victims of incest suffer greatly because of their experience. When people make jokes about it, it trivializes what they went through. How would you feel if you were an incest victim and someone made fun of you for it?
I'm just making light. Sometimes we need to laugh at the dark stuff.
That's not how you make people feel better about themselves. You're just making things worse by bringing up their trauma.