This is a true story, according to my sister. Although I do not remember this. My sister shared this story during her toast to me at my wedding reception. I do not think I've ever laughed so hard in my entire life.
According to my sister, when I was around 9 or 10, and she was around 7 or 8, I sat her down on her bed and we had the following conversation:
Me: "Do you know what sex is?"
Heather: "Nooo. . ."
Me: "It's when Dad puts his penis in Mom's vagina!"
Heather: Painful, stunned silence.
After about five minutes of my letting this information sink in, I then add, "And there's no Santa Claus, either!"
My poor sister insists that Christmas was never the same for her after that.
But I am the older sister -- it was my job to share such knowledge with her.
Merry Christmas! (And Heather, I'm really, really sorry I did that to you!)


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I was a dork though so my sister would have believed nothing I said about sex. Maybe Dr. Spock though ;0)
When I was about four years old, my 3 older sibs sat me down and bluntly told me there was no Santa, all because they wanted to switch opening presents on Xmas eve instead of AM but had been told by the parents that it had to wait until I no longer believed.