I think it was just easy for Bill Clinton.
Monica Lewinsky was there in his office, offering herself to him, eager and willing.
Plus maybe the thrill of getting away with it, which obviously backfired.
The part I didn't like about the documentary was the onscreen names and titles for the various legal investigators. Only if you recorded the program and paused the video could you read the titles, they flash on and off the screen so fast, over and over throughout the program. I didn't know Susan McDougall was still alive. It's not the best documentary I've seen on the subject, but it was somewhat informative. For an hour, though, it only gave you a small piece of the total picture.
But it was interesting to see it presented from an investigators' perspective, as they discovered the first clues and unraveled it. I was surprised that Vince Foster was perceived as a very nice guy by those who worked closely with him. And was apparently driven to suicide when he was made the fall guy to take the blame in one of the Clinton scandals.