Sex Differences in Post-Coital Behaviors in Long- and Short-Term Mating: An Evolutionary Perspective

Few empirical studies have been devoted to exploring behaviors occurring immediately following sexual intercourse. Therefore, this study conducts an exploratory investigation of various post-coital behaviors that the authors propose may reflect the divergent adaptive reproductive strategies of each sex as understood from an evolutionary perspective. An online questionnaire was administered to 170 individuals examining sex differences in post-coital compared to pre-coital activities related to pair-bonding with long-term mates, as well as a variety of common post-coital activities comparing short- and long-term mating contexts. It was found that females were more likely than males to initiate and place greater importance on several behaviors related to intimacy and bonding following sex with long-term partners. Males were more likely to initiate kissing before sex, and females after sex. Intimate talk and kissing were rated by both sexes as more important before intercourse with a long-term partner, whereas cuddling and professing one's love was rated more important after sex. In a second set of more specific post-coital behaviors, females were more likely to engage in post-coital behaviors related to bonding with both short- and long-term partners, whereas males were more likely to engage in ones that were extrinsically rewarding or increased the likelihood of further coital acts.     

Peer collaboration: conflict,cooperation, or both?

The present study sought to characterize the mechanism of cognitive change during peer interaction. Forty-eight focal subjects (8-year-old females) were paired with either their mother or their best friend for dyadic discussion of two socio-moral dilemmas. The focal subjects were pretested and posttested to assess any change in their socio-moral reasoning. The hypothesis tested was that subjects cooperatively co-construct solutions to dilemmas; therefore, the discussions regarding solutions they eventually accept, as opposed to those they reject, will be positively related to posttest performance. Contrary to expectations, it was discovered that only the discussion of rejected solutions has a significant relation to cognitive outcome. Close analysis revealed that the consequence of a rejected solution discussion often is the focal's proposal of a more acceptable solution, and this also has a strong relation to outcome. A new conceptualization of collaboration is proposed, one that focuses on the importance of dyadic consideration of multiple perspectives. The consequence of such consideration is both critical analysis of ideas (socio-cognitive conflict) and co-construction of new understanding (cooperation).     

Index

Abstract

Korea in Focus, 1994, a twenty-five-minute VHS video produced by the Korean Film Production Center, Seoul, Korea. Reviewed by John Douglas Hoge.

Social Studies Guide on Korea for High School Teachers by Craig S. Coleman, published by the Korea Society/Los Angeles in July 1994. Reviewed by John Douglas Hoge.

Armento, B., and T. Murray, 1994. Teaching about Korea: Lessons for Students in Grades 4–12. Korea Society–New York, ATTN: Education Programs, 950 3rd Avenue, 8th Floor, New York, NY 10022, (212) 759–7525, FAX (212) 759–7530. $3.00 postage and handling. Reviewed by Robert W. Wood.     

A biopsychosocial model of glycemic control in diabetes: stress, coping and regimen adherence.

This study examines stress, coping, and regimen adherence as determinants of chronic and transient metabolic control in diabetes. We also examine the interaction of biologic vulnerability and psychosocial risk factors to see if Type 1 (insulin dependent diabetes mellitus) or Type 2 (noninsulin dependent diabetes mellitus) diabetes had greater responsiveness to psychosocial risk factors. Analyses of data from insulin-treated adults with Type 1 (N = 57) and Type 2 (N = 61) diabetes supported the biopsychosocial model. For Type 1 diabetes, self-controlling persons had better glycemic control and emotional persons had worse (because of differences in stress). All of these associations were mediated by regimen compliance. For Type 2 diabetes, self-controlling persons had better glycemic control for reasons other than regimen compliance. There was an interaction between biologic and psychosocial factors, with psychosocial factors accounting for more variance in glycemic control within Type 1 patients. Stable psychosocial resources (i.e., education, being married, and positive coping styles) were associated with better chronic glycemic control, while stress and regimen nonadherence were associated with worse transient glycemic control.     

Operations research in the management of the airlines

This paper is intended to present an introduction to the use of operations research in the international airline industry, and to demonstrate the scope and significance of the airline OR activities. First, the special reasons for the viability and spread of airline OR are discussed. Then a functional framework for an airline is outlined, to be used in analyzing the problems of an airline and relating the OR work to it. Four major applications are described, corresponding to four major components of the framework. These applications are: schedule development, overbooking control, crew scheduling and engine management, respectively. In each case we describe the problem and its significance, indicate the types of solution techniques which have been developed, and assess the implemented solutions. The paper concludes with comments on the current state-of-the-art and the future of airline OR. A detailed bibliography is given.Both of the authors have been operations research directors in major airlines and more recently have focused their attention upon the industry as academic researchers. This background has provided us with an unusual opportunity to analyze the role of OR in the airlines, and our paper seeks to share with the reader some of the insights we have gained thereby.     

A mixed-methods investigation of successful aging among older women engaged in sports-based versus exercise-based leisure time physical activities

This mixed-methods study compares active older women in different physically based leisure activities and explores the difference in subjective ratings of successful aging and quantifiable predictors of success. A survey was administered to 256 women, 60–92 years of age, engaged in a sports- or exercise-based activity. Quantitative data were analyzed through ANOVA and multiple regression. Qualitative data (n = 79) was analyzed using the approach associated with means-end theory. While participants quantitatively appeared similar in terms of successful aging, qualitative interviews revealed differences in activity motivation. Women involved in sports highlighted social/psychological benefits, while those involved in exercise-based activities stressed fitness outcomes.     

Sopranos but not tenors live longer

The longer life spans of females compared to males has been attributed to the effects of sex hormones. Since experimental tests of this possibility in humans are unethical, indirect studies have been relied on for evidence. The present study offers such indirect evidence by comparing life spans of female and male opera singers, since sex hormones are known to influence development of voice. Life spans of sopranos were found to be significantly greater than those of lower voice registered contraltos, even after controlling for birth year. Differences among male opera singers were not statistically significant. The data support the hypothesis that females live longer than males because of the beneficial effects of estrogens on longevity-related genes.