It has to do with cleavage. Pressing boobs together makes their volume increase, and push them higher which creates more cleavage. They look - Fashion & Beauty Question
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What is it with guys and boobs? - GirlsAskGuys
What do guys think of girls who show more skin vs. girls who don't? - Quora
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What is it like having boobs? - GirlsAskGuys
What is it like having boobs? - GirlsAskGuys
What is a guy thinking when he is staring at a girl's boobs? - GirlsAskGuys
When you show cleavage, do you want men to look or not? - GirlsAskGuys
Nice Girls
9 things women do to grab a man's attention - Times of India
Do girls like when boys squeeze their breasts? Does it feel better if boys lick them? - Quora
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Why do women show cleavage but then get angry when men stare at their globes? - GirlsAskGuys