Sex presumably facilitates pair bonding, but how do partners remain pair-bonded between sexual acts? Evolutionary perspectives suggest that sexual afterglow serves this purpose. We explored how long sexual satisfaction would remain elevated following sex and predicted that stronger sexual afterglow would characterize more satisfying partnerships. We pooled the data from two independent, longitudinal studies of newlywed couples to examine these issues. Spouses reported their daily sexual activity and sexual satisfaction for 14 days and their marital satisfaction at baseline and 4 or 6 months later. Results demonstrated that sexual satisfaction remained elevated approximately 48 hr after sex, and spouses experiencing a stronger afterglow reported higher levels of marital satisfaction both at baseline and over time. We interpret these findings as evidence that sexual afterglow is a proximal cognitive mechanism through which sex promotes pair bonding.
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Quantifying the Sexual Afterglow: The Lingering Benefits of Sex and Their Implications for Pair-Bonded Relationships.
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2 Department of Psychology, University of California, Los Angeles.
Sex presumably facilitates pair bonding, but how do partners remain pair-bonded between sexual acts? Evolutionary perspectives suggest that sexual afterglow serves this purpose. We explored how long sexual satisfaction would remain elevated following sex and predicted that stronger sexual afterglow would characterize more satisfying partnerships. We pooled the data from two independent, longitudinal studies of newlywed couples to examine these issues.
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Division of Marine BioScience, Korea Maritime and Ocean University, Busan 606-791, Republic of Korea. Electronic address:
Photoperiod is considered the most important factor that entrains animal rhythms, including the reproductive cycle. The present study tested differences in sex maturation and sex steroid hormones of yellowtail damselfish (Chrysiptera parasema) exposed to a white fluorescent bulb (12L:12D and 14L:10D) or long-afterglow phosphorescent pigment (LumiNova sheet) for 4 months. At the end of the experiment, in the phosphorescent group, mRNA expressions of gonadotropin hormones [(GTHs, including gonadotropin (GTH) α and luteinizing hormone (LH) β)], estrogen receptor (ER), and vitellogenin were significantly higher than in the photoperiod groups (12L:12D and 14L:10D), and these results are consistent with those of Western blotting for protein expression.
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