Adult Coloring Books: 5 Grown-Up Coloring Books Kids Should Never See (PHOTOS, NSFW)

The coloring craze has indeed ignited among adults and judging by the sales of adult coloring books in the last few months, it has become one of the trendiest things grown-ups do for relaxation. Sometimes, adults share their books with their kids for family bonding activities, especially when the children like the more elaborately detailed drawings for grown-ups. After all, coloring is a kid's activity. However, there are some book releases that take "adult" coloring quite literally.

"Color My Boobs: A Titillating Coloring Book for Adults"

It's a fun and funny gift gag for adults and reviewers from users at Amazon have said that they've enjoyed coloring this book's pages. In fact, it has mostly received five-star ratings. However, this is the type of book you shouldn't be sharing with a 5-year-old just yet (unless you're ready to answer some awkward questions). Let the children stick with coloring Hello Kitty and bunny drawings for a few more years.

To learn more about coulrophobia, click HERE. And for more grown-up coloring book ideas, check out this article about popular books or this article about hosting your own coloring party!

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