
Originally Posted by
Big D
According to Wikipedia, the FFXII Ultimania says that male and female Viera live in separate villages, and maintain pretty strict isolation from one another except when they have to make contact. No idea of the rationale for this, but I guess it could have something to do with avoiding over-population ('cause of their long lifespans) or a self-destructive reaction to their culture and species dwindling away.
In the game, we only ever see female Viera around the place, so presumably the males are even more cloistered.