In looking at my "100 Tropical Fruits, Nuts and Spices for the Central African Home Garden", the authors say that the "trees are male-female dominant, meaning that some trees produce mostly male flowers and are low producers, while others produce mostly female flowers and are high producers".
I am taking this to mean that they are not strictly dioecious, which is good news for those of us who only have a few trees.
Cheers,
Carolyn