Inside Woody Allen's Sick Fascination With Teenaged Soon-Yi & Her Sister's Sex Life

Soon-Yi Previn sparked scandal when she accused her adopted mom Mia Farrow of abuse in a new interview, but her sister once spoke out about how Woody Allen had a bizarre fascination with their teenage sex life.

Daisy Previn, 43, who Farrow adopted in the 1970s, along with Soon-Yi and Lark, now deceased, with her then-husband Andre Previn, was 15 years old when her mom's boyfriend, Allen, became interested in the intimate details of her and her siblings.

"He would say, 'Tell me what you did secretly with your boyfriends that you couldn't tell your mom,'" she recalled in 1997.

"I didn't think anything of it," Daisy said. "I thought he was trying to talk to me as a father. I didn't know any better."

But she did once it came to light Allen, 82, had started an affair with her sister, Soon-Yi, 47.

"I think maybe he was trying to pick out one of us," said Daisy, explaining, "He knew I was in high school and was always going out with guys, so he couldn't prey on me. But Soon-Yi was young, innocent. She never had a boyfriend. She'd never even kissed a boy."

Daisy noted Soon-Yi seemed to change around the time she believed Allen and got together when her sibling was 21.

"Soon-Yi thought she was superior to the rest of us," she said. "She was always making fun of the fact that we had younger boyfriends."

"She and Woody kept it really hush-hush, but after we found out, things came together and you say to yourself, 'Something had to be going on then.'"

Sadly, said Daisy, everything changed once her adopted dad and sister's story became public.

"It changed us a lot," she said. "Everybody was different. Soon-Yi gave up her entire family for him. What's more important than your family?"

As RadarOnline.com reported, Soon-Yi recently admitted in a new interview that she and her now-husband's unlikely romance was still "a huge betrayal on both our parts, a terrible thing to do, a terrible shock to inflict on her."

"I know this is no justification," she said, "but Mia was never kind to me, never civil. And here was a chance for someone showing me affection and being nice to me, so of course I was thrilled and ran for it."