if you look behind the BRACT ( a single leaflet at the node, stalk, branch intersection) behind the bract 6ou see the primordial or pre flower sex organ . with a small pocket scope you can look at it .Males will look like either a crab claw or a ace of clubs. a little stalk with some little balls on top . the crab claw looks very curved.
The FEMALE looks like a very slender vase with a hair coming out if it . its look is almost straight but slightly curved .
now there could just be a bit of leaf undifferentiated and look like either Male or female
you can sex them at about 4 weeks by looking at the primordia which is a pre flower sex organ at the intersection of the stalk/branch /leaf petiol behind 5he bract. ( little single leaflet) .it will either look like a crab claw or ace of clubs or a long slender slightly curved vase with a little hair coming out if it.
it is very small ( 1mm) and will most likely need a small pocket scope .
sometimes it is still unsexed and the little leafs could be mistaken for one or another.
my opinion is you will be able to identify 80 to 90% of them immediately if not all.
I have had a VERY high success rate bordering on 100%