I think the reason all of them are women is so Mokoto can be oblivious to the advances of all the most powerful people in El-Hazard
This reminds me... some years ago myself and old-school El-Hazard expert Erin did some speculation as to how the Eye of God gene gets passed on. We concluded that it must be mitochondrial, as mitochondrial DNA is the only form to be passed on with 100% efficiency. However, there's no way of moderating what genes get passed on to what gender. Males would inherit the gene as well as females, although unlike females they would be unable to pass it on (mitochondrial DNA is only inherited from the maternal line). This would still lead to the problem of male offspring being able to utilise the gene (unless there was some other factor at work, I suppose). In my fanfics I proposed that the royal line had been engineered so that only female children could be conceived, although even this isn't a complete fix, as after several generations there could still be potentially scores of women, with a maternal royal ancestor, capable of activating the Eye of God. Which clearly wasn't the case in the series, as it would have been much easier for the Phantom Tribe to kidnap Fatora's distant cousin than Fatora herself. I suppose that reproductive activities within the royal house must be strictly regulated. Heh... maybe this is why Fatora's lesbianism is tolerated to such a degree ^_^In any case, I agree with the view of Roshtaria as a maternal society. El-Hazard as a wider area is more debatable: the majority of rulers/diplomats seen in OVA1 are male, even if the dominant power is run by women (presumably out of necessity).