I knew all of them. Should I be concerned about my gender? ;)

The page links to an interesting vocabulary test. I probably scored low because I said "no" to words I recognized but did not know the meaning of.

On the basis of your results, we estimate you know 76% of the English words. You said yes to 76% of the existing words. You said yes to 0% of the nonwords. This gives you a corrected score of 76% - 0% = 76%. This is a high level for a native speaker. [!]