Conception and Contraception” is a Small Topic from the book I’m a Boy, Sexual Maturity (Ages 15+)
Your son has begun having ejaculations and has completed puberty. Now is the time for him to learn about the responsibilities that are part of becoming sexually mature.
This Small Topic, written for boys 15+ years, explains the biology of conception and how the basic contraceptive methods work including abstinence.
Here are a few pages from this Small Topic