I wonder how much sex was going on behind the scenes?

Basically, this is your sex addicts wet dream. It's a a story about about a sex addict (Warren Beatty) written by another sex addict (Woody Allen). And it stars Allen and notorious womanizers Peter O'Toole and Peter Sellers. And notorious sex addicts Romy Schneider and Capucine. What the hell is going on in this film? It's just about a bunch of sex addicts having sex. Even the group session scenes are about addiction. And with three egomanical sex addicts in the three male leads. Even Richard Burton makes a small cameo. I wonder ifn't the making of the film wasn't much more fun than the film itself? At least for those involved...