The Wonders of Life pavillion should be open through Feb 26th. This is a great show, and perfectly appropriate for 7 and 8 year olds. It's much more conceptual than graphic, and focuses much more on relationships than the mechanics of making a baby.
They do show a textbook like drawing of the male and female parts and a cartoonish drawing of the sperm and egg cells, but they never really explain intercourse--they instead show how a couple met, got to know each other, fell in love, got married, and decided to have a child. They show the couple kissing in bed together, fully clothed, and in a very loving way. They then explain that the act is private and move on to the couple getting the happy news that they're having a baby.
It's really a wonderful start to the "birds and the bees" talk--very positive and very focused on a loving family environment.