Why do guys flex their chest muscles at women?

Anonymous
I have a male friend who Iโ€™ve known for quite some time. Him and I went to Cali over the weekend. We were out at a social event and he flexed his chest at me at least 7x. In response I did smile and laugh a little and he smiled back. Keep in mind we are just friends.
Why do guys flex their chest muscles at women?
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