I topped the 5th node. Topping the the 5th node forces the plant to show it's sex. When I topped this pheno, 3 tops started growing. It is a confirmed female popped from seed.
I don't think i've ever heard of sexing a plant by topping. Did you mean top at 5th node and then root the cutting and sex the cutting?
@BrandonN, No. just simply top the 5th node when it grows that big. I learned this from someone who pops many seeds.