I realize that this text is translated, therefore, this may not be an accurate comment, but I respectfully suggest that in the text the woman is passive to the misconduct (receives it), but in the comments/answers you are assuming she is perpetrating it. In some cultures a woman who is adulterous is still the passive person because she "received" the advances of the other man. There is also nothing to make clear if she was willing in the story. The man may be distraught because she was assaulted and he failed to protect his wife. (he is ashamed in the story, not angry with her). 

This is what I mean: 
"He engages in sensual misconduct." the man is the actor of the misconduct

"1) Non-recitation is the stain of the hymns." the hymns are stained by not being recited, they are not active in their own "stain" but the inaction of others makes them stained. 

"(2) The stain of houses is lack of upkeep." here the house which is not maintained is stained by the inattention of others. It is passive to the action. 

"(3) The stain of beauty is laziness." again, same, the beauty which would shine is diminished (stained) by others not expressing/creating it. 

"(4) Heedlessness is the stain of a guard." this is a little less clear. When I take the definition of heedlessness as ( adjective. 1. careless; thoughtless; unmindful: Heedless of the danger, he returned to the burning building to save his dog.) I can see that a guard put in unnecessary danger by others or that he may be careless. Both are valid to the text as translated. 

"(5) A woman’s stain is misconduct." she is stained by the misconduct, but it does not say if she is the doer, or someone does to her this misconduct. It could be completed as *a woman's stain is a man's misconduct* or *a woman's stain is the result of her own misconduct* Perhaps it is both and that is why neither is specified. 

"(6) Miserliness is a donor’s stain." it is unclear if it is his own miserliness (the limit to his generosity), the lack of other people's joining him, or his giving (he is a donor) without clean motivation. 

"(7) Bad unwholesome qualities are stains in this world and the next." neither this world nor the next are the perpetrators of the unwholesome qualities, they are stained by the actions of others. 

"(8) A stain graver than this is ignorance, the very worst of stains." if I understand it, this is a continuation of the 7th, that this world and the next are stained by the ignorance of others (not their own).