Quiff flies

Another name for gnat. My Great Grandma came up with the word "quiff". A quiff is another name for a vagina. One day, another family member had a dog laying out in the sun and there was a swarm of gnats flying around the dogs vagina. That's when my family started calling gnats "quiff flies".

Quiff flies swarm into such a small area, how do they not fly into each other?