in humor 10 Wildly Inappropriate Coloring Books That Make Us Want To Be Kids Again by Mary McCaw 5. Swear Word Adult Coloring Book Buy It Here 6. Forever Alone – An Adult Coloring Book for Singles! Buy It Here Page 3 of 5Previous 12345Next Written by Mary McCaw Mary is a freelance writer and editor. She's based in San Francisco, but lately, home is wherever her suitcase is. If you really are what you eat, she is at least 50% pizza.