1. Get someone who has seen vaginas to draw one.
2. Get someone who has never seen a vagina to draw one, using only the drawing from the above step as a reference.
3. Get someone who has never seen a vagina to draw one, using only the drawing from the above step as a reference.
4. Get someone who has never seen a vagina to draw one, using only the drawing from the above step as a reference.
[...]
98. Get someone who has never seen a vagina to draw one, using only the drawing from the above step as a reference.
99. Get someone who has never seen a vagina to draw one, using only the drawing from the above step as a reference.
100. Get someone who has never seen a vagina to draw one, using only the drawing from the above step as a reference.
End result: