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if anything, it's the lack of confidence in the last couple of generations and therefor an increase in people obsessing over the characteristic they can center on sexually when the woman they are staring at isn't looking. when boys and men had more confidence, they would look at girls from the front with more vigor and have no qualms with taking looks at a girl's chest with the knowledge that said girl is completely aware and would therefor build that initial bond and attraction between the two through the booba