Pic 4. At the internode where the leaf stem meets the main stalk you can see new growth. Bellow the new growth at about where all the stems meet, a calyx will emerge and shortly there after small pistols will emerge from it, appearing to be two small white hairs. This is the female reproductive anatomy. In the case of a male, small round pre-flowers will emerge and eventually develop into mature pollen producing flowers. Sex is not determinable by these photos. Good luck.