Sex: Myths, Lies and Straight Talk

Jennifer is human proof that women today may not be more monogamous than men. Since her lover moved away, she's been looking for a new sexual partner through an online dating service for spouses who want to fool around.

That's what keeps Ricci in a business that is growing.

6. Is It Unsafe to Have Sex During Pregnancy?

When it comes to questions about sex during pregnancy, there are as many right and wrong answers as there are pregnant couples. What feels right for one couple may not work for another.

Some say sex during the second trimester is great.

"They say your blood is heavier down there, so I would recommend it for you during pregnancy. It might be better than before," one woman said.

But a dad-to-be sadly disagreed. "The myth for me was that sex would be great during pregnancy. That really didn't happen," he said.

But there is one old wives' tale about sex during pregnancy that ABC News' Dr. Timothy Johnson thought had been debunked for good: the idea that sex during pregnancy could harm the fetus.

It turns out 40 percent do have that fear, according to a poll by, the No. 1 Web site for expectant parents.

"I don't know that people are walking around on the streets saying, 'I'm concerned about this,' but when they're in their private moments, and they're faced with the situation in their home, I think they are really concerned," said Linda Murray,'s executive director.

Some 80 percent of the people who answered the poll thought about the baby in some way when they were having sex.

"Some of them felt like maybe the baby could feel them or see them in some way," Murray said.

And some were very worried about physically hurting the baby, according to Murray.

Dr. Jacques Moritz, chief of gynecology at New York City's St. Luke's-Roosevelt Hospitals, gave us the bottom line about sex during pregnancy.

"There are some medical conditions that might preclude sex. But if your doctor gives you the green light and you feel like it, go ahead," Moritz said.

The biggest surprise in the poll: It's dads who say no to pregnancy sex -- 50 percent more than moms.

There's another pregnancy-related myth, that sex at the end of pregnancy can bring on labor. Some 50 percent of the couples in the BabyCenter poll admitted they had tried it. It turns out it may work. Hormones found in semen and hormones released by the uterus may stimulate labor when a woman is ready to deliver. At the very least -- it can't hurt.

"If you're waiting around and you have nothing else to do, you might as well have some fun," said Murray. "You're certainly not going to have sex for the next few weeks."

7. Does Size Matter?

America is a country obsessed with size. From big buildings to big cars to big muscles, Hollywood has shown us that all American males want to measure up -- and that includes measuring up "south of the border," so to speak.

"Men have been assured that size doesn't matter, women have been told that they only have feeling in the first two inches of their vagina," said Joy Davidson, a clinical psychologist and sex therapist.

But according to Davidson, size DOES matter. "We've all been sold a bill of goods about sex and now it's time to tell the truth," she said.

According to Davidson, the notion that size doesn't matter ignores the anatomical facts. "The reason size matters is very simply that women do have nerve endings deep inside the vagina," she said.

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