Help the students get involved with the lesson by asking some of them ahead of time to research the cultural setting of a particular Bible story. Some will enjoy this particular type of learning more than others, and they may come up with some interesting background that will bring the lesson to life for the entire class.
In today’s world that often does not revolve around an agricultural society, some background about polygamy and childlessness in its cultural context might be helpful for understanding the issues in this lesson. Assign some of the more analytical students to bring information to share with the entire class. It will also give those students a chance to be the “authority” for a while instead of it always being the teacher.