You had a very good question, don't worrie about the troll posts. I had the same question a few years ago. What I found is auto are hard to change to males. Not saying it cant be done just never worked for me. And it dose not work taking clones. Now their is one way but takes a bit of time and you basically lose a plant to do it. Let your girl go, dont harvest when ready. If you let them go past their prime, they will make one last effort to reproduce. They will make seeds before they die. I have around 50 Think different seeds from this method tho it take 16 weeks<----- I know right 16 weeks... but it works some times cant say 100% of the time it will work, but it has for me every time.