They say the "hero always gets the girl". It is generally agreed that when a daring lad does something particularly noble, something worthy of being deemed a "hero", many women find said noble feat to be attractive. This could be applied to a hero simply saving a single maiden, at which point he becomes "her hero" and she enjoys the fact that he did not leave her unsaved. It could also be applied to a hero saving a larger group of people and his broad heroism is appreciated by all women present, whether they be the ones being saved or casual non-heroic observers. Although if said women were either anti-heroism or also a hero, that may not be the case.
Nonetheless, it can be universially agreed that being at least PARTIALLY a hero as opposed to NOT being a hero will help your chances with the ladies. So it makes sense that when a particular mute saved the entire world from a horrible demon king, he was showered with affection from pro-heroism women.
The strange part about this, though,