Model Cindy Margolis has told how she was so obsessed with having a baby that she launched into a 14-day sex marathon on her honeymoon.The Playboy pin-up once feted as the world’s most downloaded woman says she had non-stop sex on the beach, in the ocean, while swimming with dolphins, on a swing, in a tree, on a beach chair, in a cabana, in the woods, and around the coral reef.She also had sex with her husband, Guy Starkman, in the bath tub and even under the snack bar.“But it didn’t work. I must be going nuts,” she told The New York Post.”I thought I was being punished for my past mistakes: I should never have cheated on my first love with that cute actor who turned out to be a jerk!”In her new book, “Having a Baby . . . When the Old-Fashioned Way Isn’t Working,” out this week she writes of the methods she used in her attempts to start a family.“I set up a baby shrine next to my bed . . . I wrote letters to my unborn baby. I lit fertility candles, saw a psychic and then a healer, and even had my stomach blessed by a priest, a rabbi and a minister. When all that didn’t work, I was convinced it was because God saw through me,” Margolis writes.She became very obsessed. Whenever Margolis thought she was ovulating, she demanded her husband rush home to bed her.She relates: “I would call Guy off the basketball court, out of a meeting, away from a family function, and even home early from a business trip . . . I even told him once that if he didn’t get home within 10 minutes and have sex with me, I would find someone else who would.”After years of trying, Margolis consulted specialists who recommended in vitro fertilization and surrogacy. In 2002 she gave birth to a son, Nicholas Isaac. Three years later she had twin girls, Sabrina and Sierra, through a surrogate. “Please, never give up the faith,” she urges parents. Cindy Margolis at the Opening of the 40/40 Club in Vegas

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