Here are the possible solutions for they have dark hair clue
Answer
Clue
Relevancy
greeneggsandham
Clue
Source of "Say! In the dark? Here in the dark! Would you, could you, in the dark?"
brunets
Clue
They have dark hair
Definition
BRUNET, a (male) person with brown or dark hair
newt
Clue
Gingrich who said "females have biological problems staying in a ditch for thirty days because they get infections and they don't have upper body strength"
Definition
a tailed amphibian of the salamander family, also EWT
gothmilk
Clue
"It builds strong bones, but who cares in this dark, dark world..."