All I can say is that this looks like fun, and for many men who haven’t taken Biology of Women in college, it’s probably going to prove to be educational as well. Here’s the author’s own description:

Vaginas are a fingerprint. Captured in this book along with fun puzzles and games is the uniqueness of the vagina beautifully illustrated. From the compact smooth vagina to a coiffed vagina with full lips. Some are pierced, some are tattooed, some are soft spoken and some are in your face! Illustrate these beautiful vaginas with your imagination and show your love for what makes your world go round!

Big Coloring Book Of Vaginas [bigbookaltpress.com]