An interesting situation arose when I routed the manuscript for Mission for review to key subject matter experts who had helped in its development. Two are Hollywood historians, one is a WWII historian, and two are aviators who flew with Jim Stewart in the war. One of the fliers took umbrage with my depiction of Jim’s sexual exploits in pre-war Hollywood, and most stridently so. No spoilers here, not for a book still four months from release (and the embargo is still in effect), but suffice to say Jim was a far busier boy than you’d expect during his five-plus years in Hollywood prior to joining the military in 1941. The flier said, basically, that in his day you didn’t speak of such things, and he didn’t want Jim to be remembered that way.

I did some soul-searching after receiving this feedback because I greatly admire the man who delivered it, and I wondered if he was right that this type of information has no place in a book about Stewart’s military career. Here are the meanderings of my mind as I thought it through:

You’d never know it from the characters she played onscreen, but MGM contract star Ann Rutherford was another of the busy ones around town.

Sex wasn’t invented by the counter-culture of the 1960s. Sex was a favorite pastime of Hollywood citizens going back to the first days of hand-cranked cameras in the silent era. All roads in my research for Errol Flynn Slept Here, Errol & Olivia, and Fireball led to, well, sex. Errol Flynn was a big fan of indiscriminate sex. So was Clark Gable. Carole Lombard nurtured a healthy sexual appetite and did what came naturally and so did Jean Harlow. Even—dare I say it—Olivia de Havilland succumbed to pleasures of the flesh in an environment in which many of the world’s most beautiful, suddenly rich and famous people were crammed into a few square miles of exotic Southern California real estate, with no rules or chaperones. It became a matter of sport and ego to see who could bag whom, and Marlene Dietrich might be the prototype for sexual athletics as will be revealed in Mission when she looked at her lovers not as men or women or actors or people but as “conquests.”

If you’re a 30-year-old heterosexual guy and your day-job requires you to kiss Hedy Lamarr or Lana Turner—women whose every move is of interest to an entire movie-going world—what the heck are you going to be inclined to be thinking about but, My God this is a beautiful woman! If you’re a heterosexual woman known as a glamour queen and the script says today you will be romancing Flynn, Gable, or Doug Fairbanks Jr., and you’re looking into their eyes all day long, feeling their beating hearts, are you supposed to turn that off along with the soundstage lighting at 6 in the evening?

Olivia de Havilland tells a funny story about being in the clinches with Flynn shooting the love scene for Robin Hood over and over and “poor Errol had a problem with his tights.” You betcha. He was 28; she was 21. Nature was taking its course.

Why, Robin, I do believe you’re happy to see me.

There was a whole lot of nature going on in Hollywood by the 1930s when Jim Stewart reached his prime. Going into the Mission project I had heard that Stewart was known for having a “big stick” and I couldn’t even imagine it from this small-town product with a strong Presbyterian upbringing, but son of a gun, America’s boy next door had a side to him that reveals a lot about who he really was and what his psyche needed. “He had an ego, like all of them,” said a man who knew the older Jimmy Stewart well.

A picture started to emerge for me as I searched for the “real Jimmy Stewart,” not the lovable old guy on Johnny Carson, but the young one roaming Hollywood and then, seemingly inexplicably, running off with a big grin to join the Army nine months before shots were fired by Americans in what became WWII. And part of the story of who Stewart was, a significant part, involved his Hollywood love life, which meant that after all my soul searching, the juicy stuff stayed. I decided to go all the way … just like Jim.

Stewart once told his perturbed BFF Henry Fonda, “Hank, I don’t steal your dates. They steal me.”