Abstract 
 
 We tested several hypotheses regarding the relationship between marital characteristics and sexual outcomes among 1,656 married adults ages 57–85 years from the 2005–2006 National Social Life, Health, and Aging Project. Results showed that individuals in their first marriage had more frequent sex than remarried individuals; marital duration had a curvilinear (U-shaped) relationship with frequency of sex; and a linear relationship between marital duration and frequency of sex varied by gender such that men had more frequent sex than women in younger marriages. We speculate that relationship permanency may drive the greater sexual activity in first marriages and sicker men in younger marriages may drive frequency of sex for women in younger marriages. ||||| The study also found that older people still in first marriages have sex more often than those who have remarried 
 
 While people in the early years of marriage have sex more frequently, and their sexual activity tapers off over time, a slight rebound occurs for those whose marriages endure longer than half a century, according to new research. 
 
 The study also found that people who remain in their first marriages have sex more frequently than those who remarry. But frequency aside, marriage order made no difference when it came to actual physical pleasure and emotional satisfaction, said researchers from Louisiana State University, Florida State University and Baylor University. 
 
 Their study -- "Marital Characteristics and the Sexual Relationships of U.S. Older Adults: An Analysis of National Social Life, Health and Aging Project Data" -- is published in the journal Archives of Sexual Behavior, the official publication of the International Academy of Sex Research. 
 
 Researchers analyzed the relationship between marital characteristics and sexual outcomes among 1,656 married adults ages 57-85, using data from the first wave of the National Social Life, Health and Aging Project. They noted that people who survive until their 50th year of marriage -- among whom the slight rebound occurred -- are relatively few in number. 
 
 "Additionally, the study used a snapshot in time -- and therefore cannot prove that length and order of marriage caused sexual frequency," said former Baylor researcher Samuel Stroope, Ph.D., now an assistant professor of sociology at Louisiana State University. 
 
 Nevertheless, the study provided "intriguing results" for one of the fastest growing age groups in the United States -- and one whose sexual behavior rarely has been studied, he said. 
 
 One uncertainty that could be the subject of future research is the "why" of the findings. While sex becomes less of a novelty over time and frequency tends to diminish, "it may be that the permanency of the relationship contributes to sexual relations picking up a bit at the end," Stroope said. 
 
 "Growing old as a couple, with the experience and knowledge that come with that, may play a part," he said. "You are able to learn about your partner and build on that over time. You may have a higher level of trust when you feel that your spouse isn't going to go anywhere. The expectation that the relationship will continue may give you more reason to invest in the relationship -- including in sexual aspects of the relationship." 
 
 As to why "remarrieds" have less frequent sex than those in first marriages, "it may be that those who have been married in the past may not have as strong of a sense of permanence or lasting investment," Stroope said. 
 
 Michael McFarland, Ph.D., assistant professor of sociology and public health at Florida State University, was a study co-author. Researcher Jeremy Uecker, Ph.D., an assistant professor of sociology at Baylor and also a co-author, noted that "we know a great deal about sexual behavior at younger stages of the life course. This study adds to a small but growing body of research on the sexual behavior of older adults." 
 
 Added Stroope: "As people age, they tend to be more even-keeled, which may help cut down on marital conflict and facilitate regular sexual activity into advanced age." 
 
 The findings may surprise some in a society in which youth is the ideal and older adults are often subjected to ageism, researchers say. Despite stereotypes, the study joins other research in revealing that regular sexual activity remains a part of many older adults' lives -- even with declining health and the death of a spouse on the horizon. 
 
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– It's no secret that most married couples have less sex as the years go by, but those who stick it out tend to see something of a romantic renaissance—it just takes five decades to get there. Researchers looking at 1,656 married adults ranging in age from 57 to 85 have found there is eventually an uptick in the frequency with which couples have sex. What's more, those in first marriages are having more sex than those who have remarried, report researchers from Louisiana State University, Florida State University, and Baylor University in the journal Archives of Sexual Behavior. However frequently or infrequently couples were engaging in sex, marriage order didn't appear to influence emotional satisfaction or physical pleasure. "Growing old as a couple, with the experience and knowledge that come with that, may play a part," one researcher said in a Baylor University news release. "The expectation that the relationship will continue may give you more reason to invest in the relationship—including in sexual aspects of [it]." While the results about the sex lives of one of the fastest growing groups in the US proved "intriguing," particularly because it's a topic that has yet to be studied extensively, the researchers did point out that the 50-year second wind was a slight one, and that relatively few couples make it to 50 years to begin with, thus the sample size was small. (Some research has found that couples who are more equal tend to be happy but have less sex.)