A smart wolf in a lab coat leads kids on a journey through their digestive system. A little girl eats an apple for a snack (crunch, crunch), and the apple drops into the esophagus (glug, glug) before a stop in the stomach. At each stop along the way the wolf explains in simple scientific terms what the body is doing. After the pit stop in the stomach, what remains of the apple must enter the small intestine (gurgle, gurgle), then the large intestine, and finally . . . well, you know. Hint: It doesn’t smell like roses here. http://www.amazon.com/Journey-Mister-viaje-Spanish-English/dp/193369307X
also for some light reading you might try this one .Ryan is scared to use the potty. He's afraid to have a poop because he's afraid it's going to hurt. When Ryan's parents take him to visit Dr. Gold, she engages his imagination with the story of Bill the Coyote's messy house. She also shows him what happens inside the body, and explains how different foods make using the potty easy or hard. This story, along with Ryan's "poop program," will help young children gain the confidence they need to overcome this common problem and establish healthy habits. http://www.amazon.com/Hurts-When-Poop-Children-Scared/dp/1433801302
then for something more erotica to read with your bestest friend PreSchool-Grade 2–Willy is not good at math but excels at swimming. He and his nemesis, Butch, practice every day for the Great Swimming Race. Finally, armed with goggles, a number, and two maps, he and 300 million other competitors swim madly for the prize–the egg inside Mrs. Browne. Willy is a sperm. All his practicing pays off and he victoriously burrows into the "lovely and soft" egg, which grows and grows in Mrs. Browne's tummy until it becomes a baby girl. But "Where had little Willy gone? Who knows?" However, when little Edna is old enough to start school, she isn't very good at math but she IS very good at swimming. . This breezy and amusing romp may not resolve those pesky questions about reproduction but it certainly lends personality to the process of fertilization. The double-entendre title is indicative of the cheeky and humorous text, which is lively, well paced, and essentially accurate. The line and watercolor illustrations perfectly suit the irreverent tone and include a lift-the-flap expanded page and a "find Waldo"-style spread. Both sperm and humans are endearingly expressive. . As to the science, an unclothed Mr. and Mrs. Browne are anatomically correct but the racing map of Mrs. Browne's reproductive system is confusingly vague. Nonetheless, adult readers will be thoroughly entertained and children will be charmed if not completely informed. While a relatively innocuous and engaging piece of sex ed, this title could be a potentially provocative addition to picture-book collections.– http://www.amazon.com/Where-Willy-Went-Nicholas-Allan/dp/0375830308 or if your into a more kinky scene