myrabbi once told me that the reason Hashem made it that opposite genders will blush one reason is that they will b embarrassed to do stupid things because they will end up blushing- i know that doesnt always work but he said that its a gift from Hashem when you are like that because it stops you from flirting etc
Oh, the gift of blushing – it is so embarrassing – mostly because everyone finds a need to comment and tell you you look cute. Thank the l-rd I grew out of that – age toughens you up. Now instead of blushing I just get defensive.