"Aunn doesn't know what sex is": boring. pedestrian. mischaracterizes "sweet and adorable" as "ignorant to the ways of the world"/"like a child". this dog has done corporate espionage.
"Sakuya doesn't know what sex is": funny. completely in-character despite one's first impressions. impossible to tell whether she's genuinely ignorant or just commited to the bit (the bit is "impossible to tell whether she's genuinely ignorant or just commited to the bit").
"Mamizou doesn't know what sex is": absolutely hilarious.