When I was in the 8th grade, they split up the boys and girls for a special one-day health class. Our gruff old biology teacher was pushed into service teaching the boys. I think they showed us some film featuring Mr. Sperm and Mrs. Egg, but the movie was probably made back in the 30's. Finally the old biology teacher got up in front of all these eager and curious young men and said, "Keep it in your pants, boys. Just keep it in your pants."
And that was the end of our special health class.