The elders of the pharmaceutical dynasty will likely cringe when they learn that 23-year-old Casey lists "sex, pills, pole-dancing, licking lollipops and making fun of desperate debbies" as her "interests" on the wildly popular Web site.

Pierre Kohler, a French scientific writer, claimed in another book that NASA had tested 20 positions by computer simulation and then arranged for two people to try the best 10 in zero gravity.

Only four were possible to reach without "mechanical assistance", according to Kohler. An elastic belt and an inflatable tunnel, like an open-ended sleeping bag, were needed for the other six.

"One of the principal findings was that the classic so-called missionary position, which is so easy on earth when gravity pushes one downwards, is simply not possible," he wrote.

FALLON: Do they allow double occupancy at the Paris Hilton?
PARIS: No.
FALLON: I'm a VIP. I may need to go in the back entrance.
PARIS: It doesn't matter who you are. It's not gonna happen.

"They made it at a hotel," says our source. "Greg is operating the camera. Gina is in a bra and panties. Apparently, she'd recently gotten breast implants. She's complaining that she doesn't want to take off her bra because her breasts are hurting her.

"Greg gets her to take it off. But then she doesn't want to take off her G-string because she had an appendectomy scar. Then, he says, 'Smile for Daddy,' and she agrees."

According to our source, Fahlman joins his wife on camera in an assortment of recreations that show her to be every bit the erotic thespian her former "Baywatch" castmate Pamela Anderson was on her honeymoon tape.

But, before long, Nolin appears to tire of the routine and bites Fahlman in a sensitive area, according to our source.

"The reek of the semen was so overpowering. Some of the film crew had to rush outside for a breath of fresh air."