Sex determination through eye-exam

Are you a male or a female? This is called the quick eye exam...just do it - don't cheat!

Count the number of F's in the following text in 10 seconds:

FINISHED FILES ARE THE
RESULT OF YEARS OF SCIENTIFIC
STUDY COMBINED WITH THE
EXPERIENCE OF YEARS

Managed it?
How many?
Three? (You are definitely male!!!)
Wrong, there are six - no joke!

Read again!

Apparently, the MALE brain cannot process the word "OF".