OK Americans, what's this a map of then?

Here's a map of America with different states in different shades of blue. People were asked a question and the real answer compared with their given answer. As you can see, the scale runs from minus 25 to plus 25%, so some people were quite far off the mark. But what was the question?

That is the percentage difference between actual and reported.
OK Americans, whats this a map of then?
How big is your penis?
How much is your house worth?
How many people has your partner slept with?
How far away is that object?
How much does your partner weigh?
How long have you been waiting?
Select gender and age to cast your vote:
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1 y
It's a map of how much men exaggerate the size of their penis.
OK Americans, what's this a map of then?
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