It's called mind control, brainwashing, beta programming, sex kitten programming, monarch programming, etc. It's based on trauma (physical, mental, sexual), and the natural human mind response to 'dissociate' from reality, thus to get away from the trauma.
The signs are all around you. Learn them. Ignorance is not an excuse.
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The World of Mind Control Through the Eyes of an Artist with 13 Alter Personas
http://vigilantcitizen.com/vigilantreport/the-world-of-mind-control-through-the-eyes-of-an-artist-with-13-alter-personas/