And of course someone else has already thought
to make yogurt with yeast from that area;
Here's some food for thought: It is possible to make yogurt using bacteria from a woman's vagina, but it's probably not a good idea.
Last August, Cecilia Westbrook, an MD/PhD student at the University of Wisconsin, Madison, decided to see if the stomach-churning idea was feasible, according to VICE.
To do the experiment, Westbrook used three bowls: One with yogurt made with a traditional starter culture, one with just plain milk, one with just milk and her own bodily contribution.
Westbrook left out the batches overnight and awoke to find a decent amount of yogurt in that third bowl, according to Westbrook's friend, Janet Jay, who wrote the VICE article on the experiment.