I don't know 100%, but then again, I heard that it was referenced in one of her works, something about sperm trying to penetrate air bubbles but "it doesn't know". Then there was a TL note about how "Shimimaru is a middle/highschool dropout, so don't get your knickers in a twist about how it's inaccurate". Somewhere along the lines. Granted, Junk Land (or I think it was Junk Land) was made in 2012.