ABCNews -- For people on the outside looking in, Julie Jensen appeared to have it all: a successful stockbroker husband, Mark, to whom she'd been married for 14 years, two wonderful sons and a beautiful suburban home in Pleasant Prairie, Wis. "We all looked up to her as being a perfect mother," said friend Kim Shaw. "[Julie and Mark] would always be outside, always working on some kind of project," remembered her friend and next-door neighbor Margaret Wojt. "Just laughing and having fun with it ... it was amazing to watch them." But gradually, their marriage started to unravel. Wojt's husband, Ted, told ABC News that Mark had wanted Julie to be more sexually experimental. "She said, 'Aw, [Mark] wants me to be like these other women ... his friends....