all in the family
There was this girl who needed a date to her prom, so she asked her brother to go with her.
He refused, and so she said, “Well everyone else is doing it,” and so he then agreed.
At the Prom, the girl asked her brother to dance. Again, he refused and she said,”Well, everyone else is doing it,” so he then agreed.
As they were dancing, she looked around and saw everyone french kissing. So she asked her brother to french kiss her. He refused again and she said, “well, everyone else is doing it,” so he kissed her.
After the Prom, they rode in their limousine to a deserted area. She asked her brother to have sex with her, and he refused, so she repeated herself saying,” well, everyone else is doing it,” so he then agreed.
As they were into it, she said, “You’re really good at this. About as good as Dad.”
Then he said, “Oh, I know, that’s what mom told me too.”