Paddle across Lake Constance from Lindau, an impossibly pretty town that is watched over by blue mountains.

BBC: The classic Bavarian road trip

Among this year's Lindau passengers were Eduard and Erna Kaufmann of Burghausen, Germany, who had taken their grandson on a two-day coach trip last year.

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That same year passenger Burton Closson of Cincinnati, on the Lindau tour, got knocked in the head while the coach was passing under a bridge.

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Lindau's paper was sponsored by the nonprofit National Institutes of Health.

CNN: Healthier men want more sex for more years

"Wow, 250, that's quite a number, " says Stacy Tessler Lindau, M.

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Lindau, says Eric Johnson, a retired chief financial officer of Southern Pacific, was his and his wife Barbara's favorite trip of four they have taken with Nemitz since 1994.

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Though she applauds the "direct-to-consumer" trend in health care generally--marketing prescription drugs to consumers, for instance--Lindau and others are concerned about the inevitable false alarms that come with broad-based screening.

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The trip we took--the 200-mile Lindau Messenger tour--follows the route of the Lindau messengers, couriers who from 1322 to 1824 traveled between Lindau (in southern Germany) and Milan, delivering mail and passengers by coach.

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Lindau said that women generally reported wanting less sex or receiving it less often for three reasons: Women outlive men by an average of five to six years and without a partner, women are less likely to engage in sex.

CNN: Healthier men want more sex for more years

While the supposition that men think about sex more than women isn't new, the paper's findings have wider implication for attitudes toward public health and how patients respond to doctors' advice, said Dr. Stacy Tessler Lindau, an associate professor of obstetrics and gynecology and geriatric medicine who spearheaded the research.

CNN: Healthier men want more sex for more years