How do you get 'elf' ears in The Sims 2?

I've just now found that if you 'create a sim', and with females, you go to the lightest skin tone, then the faces.

The bottom left corner of the six faces actually has the genetic 'elf' ears. If you use that face, and make her a teenager, the elf ears will show up. I realized this from 'creating a baby' and found elf ears were a common outcome.

This is my first discovery of it, however, and I was just searching to see if others had more information on it, but I'm not finding anything! It probably isn't a known subject. I figure the elf ears go away when they get to adulthood, but her children aren't far enough along for me to see =) I hope I helped