Dumb blonde - Is it a dumb joke?
I just read an article "Why Blondes Have High Fertility" by Allan & Barbara Pease. I also did a little research about it.
Do you know that blondes have higher estrogen levels that give strong attraction to males? It is likely the explanation of the phrase "Dumb Blonde" and was more exploited by the media.
They say that blondes have higher fertility levels but very low mathematical reasoning. After a blonde's 1st baby is born, her hair darkens because her estrogen level drops. It darkens even more after her 2nd child. Therefore, we hardly seen pure natural blondes at the age of 30 and above.
