I think what they do is, since a hermie is a stressed female plant, the pollen is taken and saved to pollinate a true female to produce female seeds, less chance of hermie that way. A seed from a hermie is most of the time hermie. There is a thread on here-Plant dna test girl or boy??? It questions when plants are sexed and all that, good reading. I think that is the problem, when is sex determined? When seed is made, after germed, when flowering starts? I dont think even scientists know. Imagine if a test can be done to a seed to determine sex, if it goes hermie or male its your fault at that point.