Dude, 4 years ago I was doing a large room of mostly GG#4. There were a couple of White Widows mixed in that went herm. I pulled them after I realized it, but a bit of pollen had already spread. I ended up harvesting about 4 pounds of GG4, and in the 4 pounds were 2 seeds. One popped, one didn't. The one that popped turned out to be female. I grew it out, cloned it, and now I'm 4 years into running a GG4/WW cross that is not only phenomenal, but also has never kicked out a single nanner. I'm talking about hundreds of plants - no nanners. Not ever.
So you're statement isn't true.