Is there a real version of "Understanding People's Feelings" series (the book series Sai reads)? The character Sai, reads a book which has stuff like 


  The bond between 2 people increases when you give them a nickname.


And


  When a woman feeds you, it is a clear sign that she likes you.


I want to read this book if it has a real version, or something close to it.
No, the book Sai reads is to make the fact that he doesn't know anything about human emotions more pronounced. It's to also show the fact that he takes his position as being an information gatherer into play. He tests them on the field, and treats finding his emotions like a mission.