I agree with @StealthAria - while the chars are handwaving quite a bit, it doesn't necessarily mean we need, or even should take such handwaving without question.
Of course, it is also entirely possible that it's purposely trying to pull a leg, so who knows?
This series is just the kind of dumb male fantasy that we need. A wonderful addition to the trash I read on a daily basis.
Good luck avoiding the seduction of the clutzy temptress, Maou-sama.
@Echonic Proof! shes cunning. Just has weird priorities.
I see no evidence of clear stupidity, as her strategy would be successful on any normal human. Even as truth or deception.
@Echonic: I've seen enough manga and anime where an idiot makes that claim, only to quickly succumb to the ailment in question, to know that it's utter bullshit when invoked by the character a priori rather than used as an a posteriori explanation.