The rulers of the Advent are called the Coalescence (that is singular, there is no known plural for it. some say Coalesci). The Coalescence are all female. However, that doesn't say that a man might not be influential in Advent society either, he's just not Coalesci.
Women dominate the Coalescene, but that doesn't mean that they entirely control it. It's possible that some Advent men could have the psionic powers to join their ranks.
EDIT: Fantastic Advent work.
I really wish the new artwork were in Diplomacy as character portraits, especially the incredible armored Vasari.