A shocking new book rips the lid off the sordid secrets behind TV’s The Bachelor, including booze binges, limo sex romps, and pushing gal contestants to be raunchy and wild. The behind-the-scenes scandals are laid bare in the bombshell book,Cue the Sun: The Invention of Reality TV, where author and television critic Emily Nussbaum tells how show bigwigs pried shocking and racy behavior out of women contestants, pushing them to the edge. In one revelation, casting director Marki Costello confesses to seeking gals who were emotionally shaky and could be pressured into breakdowns for dramatic vie…