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updated 10/4/2010 8:03:01 AM ET 2010-10-04T12:03:01

The male-female orgasm gap. The sex lives of 14-year-olds. An intriguing breakdown of condom usage rates, by age and ethnicity, with teens emerging as more safe-sex-conscious than boomers.

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That's just a tiny sampling of the data being unveiled Monday in what the researchers say is the largest, most comprehensive national survey of Americans' sexual behavior since 1994.

Filling 130 pages of a special issue of the Journal of Sexual Medicine, the study offers detailed findings on how often Americans have sex, with whom, and how they respond. In all, 5,865 people, ranging in age from 14 to 94, participated in the survey.

Story: Pretzel nation: Americans have sex in 41 combinations

The lead researchers, from Indiana University's Center for Sexual Health Promotion, said the study fills a void that has grown since the last comparable endeavor — the National Health and Social Life Survey — was published 16 years ago. Major changes since then include the spread of sexually transmitted diseases, the types of sex education available to young people, the advent of same-sex marriage, and the emergence of the Internet as a tool for social interaction.

Don't worry — you're normal
Dr. Dennis Fortenberry, a pediatrics professor who was lead author of the study's section about teen sex, said the overall findings of such a huge survey should provide reassurance to Americans who are curious about how their sex lives compare with others.

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"Unless, like al-Qaida, you feel there's something abnormal about the American people, what these data say is, 'This is normal — everything in there is normal.'"

The researchers said they were struck by the variety of ways in which the subjects engaged in sex — 41 different combinations of sexual acts were tallied , encompassing vaginal and anal intercourse, oral sex, and partnered masturbation.

Men are more likely to experience orgasm when vaginal intercourse is involved, while women are more likely to reach orgasm when they engage in variety of acts, including oral sex, said researcher Debra Herbenick, lead author of the section about women's sex lives.

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She noted there was a gap in perceptions — 85 percent of the men said their latest sexual partner had an orgasm, while only 64 percent of the women reported having an orgasm in their most recent sexual event.

One-third of women experienced genital pain during their most recent sex, compared to 5 percent of men, said Herbenick, citing this as an area warranting further study.

The study, which began taking shape in 2007, was funded by Church & Dwight Co., the manufacturer of Trojan condoms. Questions about condom usage figured prominently in the study, but the researchers — during a teleconference — insisted the integrity of their findings was not affected by the corporate tie.

Condoms now the norm for teens
Among the findings was a high rate of condom usage among 14- to 17-year-olds. Of the surveyed boys who had sexual intercourse, 79 percent reported using a condom on the most recent occasion, compared to 25 percent for all the men in the survey.

However, the sample for that particular question involved only 57 teens in the 14-to-17 age range. That's far smaller than the thousands involved in latest federal Youth Risk Behavior Survey last year which calculated condom use among sexually active high school students at 61 percent

Fortenberry nonetheless found the new findings encouraging.

"There's been a major shift among young people in the role condoms have in their sexual lives," he said. "Condoms have become normative."

Another intriguing finding — rates of condom usage among black and Hispanic men were significantly higher than for whites. The researchers said this suggested that HIV-AIDS awareness programs were now making headway in those communities, which have relatively high rates of the disease.

The lowest condom usage rates were for men over 50 — and the researchers said this was worrisome, raising the risk for disease since an increasing number of older adults had multiple sexual partners .

Other notable findings:

  • While about 7 percent of adult women and 8 percent of men identify as gay, lesbian or bisexual, the proportion of individuals who have had same-gender sex at some point in their lives is higher. For example, 15 percent of the men aged 50-59 said they had received oral sex from another man at some point.
  • Among adolescent boys, only about 2 percent of the 14-year-olds — but 40 percent of the 17-year-olds — said they had engaged in sexual intercourse in the past year.

The survey was conducted from March through May of 2009, with the assistance of Knowledge Networks, among a nationally representative sample of adolescents and adults. Once people were selected to participate, they were interviewed online; participants without Internet access were provided it for free.

The researchers said the 1994 survey was compiled through in-person interviews, while the new method — collecting data over the Internet — may help make respondents more comfortable about discussing sexual behaviors.

Dr. Irwin Goldstein, editor-in-chief of the Journal of Sexual Medicine, noted that the new study came more than 60 years after Alfred Kinsey — also based at Indiana University — published his groundbreaking report, "Sexual Behavior in the Human Male."

"Just like then, these papers contain material that is avant garde and often considered off-limits," Goldstein wrote in a forward to the study. "At a time when we can have nudity on HBO but cannot use the names of our genitals on the evening news, there remains a need to continue research on sexual health."

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