Type in "marijuana anatomy" into google...there are thousands of side by side pictures of male and female anatomy.
You then use your eyes and brain to make a comparison. It's not exactly rocket science..
I mean, I did that when I was 13 and I had just had my first smoke, like 20 years before I even considered growing. It's really not that hard. Even at 13, and having never smoked before, one quick glance at a picture after a 2 second search and the question was solved for ever.