Volume three is for ages and talks about puberty, as does the fourth volume for ages The final book, geared for ages 15 and up, talks about love, marriage, STDs, etc. The next one for ages answers the perennial question, where do babies come from, with humor and tact in the form of a fictionalized story. The later books also contain more possibly controversial material, such as discussions about dating, but it is handled gently and even-handed. There are five books for children, and one for parents. Later books deal with more adult issues and consequently take a more serious tone. Hollis Crossman used to be a child. Sexuality is a part of everyone's life, and who better to help you understand and explain it to your children in a realistic and biblically sound manner than the leader in Christian sex education. Teens need encouragement to respect their bodies and the place that God has created for sex in their lives. He might be a mythical creature, but he's definitely not a centaur. Presents straight facts on sexually transmitted diseases including AIDS. Now he is a husband and father, teaches adult Sunday school in his Presbyterian congregation, and likes weird stuff. There are fewer illustrations and instead of being broadly instructive they are scientifically detailed. How Do These Work? Age-appropriate language and graphics ensure the reader is not getting too much, or too little information. The books follow a good natural progression so your kids are learning only what they need to in order to understand themselves and not be consumed with overactive curiosity. Did you find this review helpful?