I think it's CULTURAL.
The Big Bang Theory Season 11, Episode 10
We'd have
the same CULTURAL background...
The Big Bang Theory Season 1, Episode 2
"An examination of the economic,
CULTURAL and political roots of slavery...
The Big Bang Theory Season 6, Episode 6
While you do provide
a certain CULTURAL diversity...
The Big Bang Theory Season 2, Episode 13
This is very interesting.
Cultural perceptions are subjective.
The Big Bang Theory Season 4, Episode 1