★ Rights sold in 10+ countries and territories, including Simplified Chinese, French, Ukrainian, Italian, Portuguese, and Dutch, making it a trusted choice for families and schools worldwide.
★ Winner of the 2025 PRH Award, with sales exceeding 250,000 copies and a long-held #1 spot in multiple Amazon categories!
★ Helps boys and girls develop healthy, confident attitudes toward sexuality, empowering children to care for themselves and understand others through knowledge, respect, and open communication.
★ The series includes four titles: Periods Are Cool, Semen Is Cool, Your Body Is Cool, Your Boobs Are Cool.

Getting your period is cool... But you need to know how it works.

TALKING ABOUT SEXUALITY IS COOL

What is menstruation? How does your menstrual cycle transform you? Does getting your period hurt? What options do you have to avoid stains? Does your first period come out of nowhere?

Everything you've always wanted to know about menstruation (but never dared to ask)—explained in a straightforward and fun way, so you can experience these changes with confidence and well-being. Because getting your period is cool, but you need to know how it works.

Cristina Torrón is an illustrator, writer, and multimedia producer. She is the author of Mammasutra, Ni permiso ni perdón (Neither Permission Nor Forgiveness), and ¿Quieres nadar conmigo? (Do You Want to Swim with Me?), and she created the sex education project Menstruita.

Anna Salvia is a psychologist specializing in sex education and the author of highly successful children's and young adult books, including ¡Así se hace un bebé! (This Is How a Baby Is Made!), ¡Se llama pene! (It's Called a Penis!), ¡Se llama vulva! (It's Called a Vulva!), La regla mola (si sabes cómo funciona) (Periods Are Cool (If You Know How They Work)), El semen mola (pero necesitas saber cómo funciona) (Semen Is Cool (But You Need to Know How It Works)), and El porno NO mola (y ahora entenderás por qué) (Porn Is NOT Cool (And Now You'll Understand Why)); as well as non-fiction books for adults: Una nueva manera de menstruar (A New Way to Menstruate), El baile de la vida en las mujeres (The Dance of Life in Women), and Viaje al ciclo menstrual (Journey to the Menstrual Cycle).