Parents need to know that Sex Is a Funny Word: A Book About Bodies, Feelings, and YOU, by Cory Silverberg and illustrated by Fiona Smyth, is a companion book for older kids to 2013's What Makes a Baby. Characters Zai, Cooper, Mimi, and Omar are kids between 8 and 10 years old who approach learning about sex and bodies very differently, affirming the various responses that kid readers might have as they work through the book. Neither reproduction or intercourse is discussed, but masturbation is described. Diagrams, definitions, and explanations explore different meanings of sex, bodies and their sexual organs, gender, touch (including "secret touch"), and relationships. Body-positive messages are communicated in inclusive text and pictures throughout. Skin color is represented in green, orange, pink, purple, blue, etc., while hair, facial features, head coverings, and clothing show a variety of ethnicities, cultures, and genders. Crowd and family scenes depict a wide range of family compositions and people of different ages and abilities. This comprehensive, thoughtful guide to bodies will appeal to older kids who are curious about bodies and, yes, sex.