Couldn't agree more. This is good advice.
Plant the seed and let it grow all the while confirming whenever appropriate that your mind hasn't changed and that your supportive.
I found that encouraging my wife to relive her most exciting past fucks while we have sex works wonders.
She sees how happy it makes me, feels less self conscious about her slutty side.
Plant little seeds and let them grown in her mind over time.
Constant praise of how pretty and sexy she looks and reassuring her that you find outwardly slutty behaviour to be a positive and praiseworthy thing. Many women have been conditioned by society to suppress such feeling and behaviours, you need to make sure she knows that you will never turn on...
Just keep reassuring her that you will not throw it back in her face and that you want this to happen. I only express doubts on here, to my wife I am always supportive and positive.