Hello thecap, all,
All this means is that a being who in this rebirth is a human female cannot become that rarest of all beings, a Sammasambuddha. Every other being who has re-become in human form as a male, also cannot become a Sammasambuddha. A Sammasambuddha is one who discovers the Truth of the Dhamma for himself after all knowledge of it has completely vanished from the world. After discovering it, he sets up the Four pillars of Buddhism: bhikkhu or. male monk, bhikkuni or female monk, upasaka or layman, and upasika or laywoman and, out of compassion, teaches the Dhamma to the world once again. Enlightened beings are Arahants of either gender, but not Sammasambuddhas.
Males, in this world, of all species, are usually stronger and more aggressive. Therefore they rule and take most of the important positions as the human world develops after each formation of the universe - especially in rural and more less industrial populations where the first glimmerings of questioning 'why are we here' 'where did we come from' 'where are we going after death' arise. This is usually the time when it is most effective for a great being, a Bodhisatta, to take rebirth and become a Fully Enlghtened Sammasambuddha.
Arahants have the same enlightenment as a Buddha.
---The trouble is that you think you have time---
---Worry is the Interest, paid in advance, on a debt you may never owe---
---It's not what happens to you in life that is important ~ it's what you do with it ---