That is quite correct. The seemingly "clean," "Goody-goody Two Shoes" type are the most wicked, conniving, scheming, calculating,instigating. That is because they have no outlet for their Carnal desires. The "naughty" type, always "kio kuay"(call the chickens) in Geylang, they are always satisfied and happy, because they get their rocks off, they get "release"(sperm release). So, they have no time to act the asshole bandit.
I have a few Aunties, now quite old already, because they got no guts to "kio ak"(call Duck), and also they are ugly and their Hubby dun want to touch them, they all day long scheme and plot, and set the whole world around them on fire. 50% of my family are not on speaking terms, because of the instigation of these wicked old Aunties.
I have not met 1 man who is half as dangerous as these frustrated, ugly old women.