I mean, why wouldn't they quit adventuring to live as simple villagers? It's a comfortable life for them thanks to their husbands (to say the least) and if they want families then obviously they can't go roaming around fighting monsters and stuff. Why is he even wondering it at all? Oh, sure, it'll probably be something else for the sake of dramatization, but the most reasonable answers are obvious.
Ceres notes they could have controlled their husbands (like slaves, even) through force. I think the reason they didn't is this thing called "not being a scumbag". That didn't occur to him...he should be ashamed. Oh yes, why didn't they beat their husbands into serving them as slaves? Gee, I can't imagine!