Tom come home from school, asked his mom:

Mom, what is sex?

His mom was flustered, but she knew this day would come, and decided to be honest.

She spend the next hour explaining to her son about the birds and the bees, and the structure and function of our organs and body, and finally where babies came from. When she was done, her son smiled, pulled a questionaire out of his pocket, and pointed to the word - sex, said:

That is cool, but how am I supposed to get it all in this little box next to the letter F and M?