FRien said:
I mean, at least in Dawn of War (don't ask me about Gladius), Sisters of Battles do have male members, but they're part of the secular clergy, while the sisters themselves are part of the regular clergy, so it's a clusterfuck but it's understandable.
And I really like that Sisters of Battle can weaponize their faith, that alone made me do a 180° on them, from considering them discount Marines to being actually very interesting to play and read about.
I've read they're also the best equipped army in the Imperium. The church is the wealthiest organization around, and they're owed alot of favors by basically everyone. As such, they get first dibs on what money can buy.
Why are the SoBs female only? A legal technicality that forbade the church from "men at arms" after attempting to take over the imperium that one time, cap stoned by the fact the chief warrior nun personally ended the coup. All very intricate and interesting as Imperium internal politics should be.