Explaining the Birds and Bees Gets Harder and Harder

I was sitting on the couch next to my little boy trying to teach him about the "birds and the bees," and I pulled out my penis and showed it to him and I told him "this is what yours will be like some day." Then he asked me why it was getting so hard, but I didn't want to get into all that just yet! He's too young to understand how the birds and bees do it, I just wanted him to see what happens when they haven't done it in a long time.