“Sperm, Fluids, and Semen” is a Small Topic from the book I’m a Boy, Sexual Maturity (Ages 15+)
Here are a few pages from this Small Topic
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, describes boy anatomy and explains how semen is formed.