Using a good male is the least likely way you will get a herm. Finding a good male is the trick but it's not the herm part you really have to worry about with males. If you breed two F1's from the same line you will get different phenotypes that will pop up in the next generation because of recessive genes mixing in different combination. To get back to the original f1's is a bit of a trick, or should I say it's not all that easy. The F1 is "Stable" after that you are trying to grow out plants that are as close to the original F1 over and over until each time you pop seeds they all come out like the F1 or whatever other pheno you might decide to isolate by back-crossing. When you see all these BX strains, that means they are working on stabilizing the strain so when you pop a seed you will know exactly what it will be.
A "Stable" strain does not mean stable as in No Hermies, it means that each seed will put off the same type of plant instead of a bunch of weird mixes with some more sativa and some more indica, etc.
Crossing a male with a female isn't going to give you hermies unless one of those two already has hermies in them.
Now when it comes to crossing and recrossing these Feminized seeds, IDK if that causes hermies. I don't think it really does, I think what happens is that a lot of these really good strains came from bagseed, so they came with hermies in them as a recessive trait. If you cross enough plants that have those same recessive genes for hermie, then you get hermies. I think it's possible to breed feminized to feminized over and over again too with getting hermies but I don't think I've ever seen anyone actually do it without getting at least some issues. But that could just be my experience too. So I prefer to use a good Male and only occasionally will I use a Feminized plant to potentate another feminized plant. I think you push your luck if you breed that way too many times but I could be wrong on that, IDK.