Why men talk how they are good at sex at first date? I was on a date with this guy and he couldn't stop bragging about it?

I was on a date with the guy and he immediately started to talk about sex.

How he never has problems with getting girls.

That he is sleeping with his friends, only good looking one's,

That he is good at sex etc

Why men talk how they are good at sex at first date? I was on a date with this guy and he couldn't stop bragging about it?
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