Thumb sucking is indicative of emotional/psychological trauma.
This brotha was telling the truth...back then i was with a thumb sucker...i found out she was fucked up on a level that blee me away. Mf was one of those next adventure in life women...she dated every type of guy from every aspect of life. She had so many stories I was like damn this woman has fucked a whole lot mf dudes and she telling me causually as hell because she use to dudes hearing her but not listening to her. That day i came face to face with woman that no other man she ever been with called her on her bullshit. She went crazy..then cried and started telling me everything. I listened to her cause she needed to get that negative energy out she been had inside her since she was 5. Fucked up part about it is she could have been a cool chick to be with but i realized shes the type of woman that will let any dude get the pussy. I mean any race, size, shape...it didnt matter to her