[LizAEBN]

Redheads are relatively rare, and blonde generally darkens with age - it's a subconcious indicator of youth, but not necessarily of the attributes desirable in a partner/ wife. As Cyndalie notes:
"Horny Guys really prefer blonde girls....to fuck
not marry."

See JFK/ Jackie/ Marilyn triangle - and I suspect many more throughout history.

... Except, of course, Thomas Jefferson