Commitment and Extra-Dyadic Sexual Activity in College Students' Friends with Benefits Relationships: Moderating Effects of Gender.

Friends with benefits relationships (FWBRs) are a common form of relationship for college students that combine aspects of friendship with sex, yet little is known about commitment in these relationships and whether they are more similar to casual relationships or to romantic relationships. We investigated associations between investment, alternatives, and satisfaction, with commitment (per the Investment Model) in college students' FWBRs and examined how associations between variables differ by participant and partner gender. Primary analyses were conducted with male-female FWBRs (n = 252). Male-male (n = 19) and female-female (n = 4) FWBRs are described. Investment was the strongest predictor of commitment for participants in male-female FWBRs, with commitment higher among women than men when investment was high. Additionally, participants' perceptions that their own and their partners' commitment was asymmetrical, as well as reports of extra-dyadic sexual activity (i.e., sex outside the FWBR) correlated with lower commitment to the FWBR. Overall, results suggest that FWBRs can be distinguished not only from other casual sexual relationships such as hookups but can also be differentiated from romantic relationships. Future research and intervention work should measure commitment and investment to predict how these relationships can persist, as well as transition, over time.

The influence of age on induced sputum differential cell counts in normal subjects.

STUDY OBJECTIVES: Sputum induction is increasingly used as a research technique and as a clinical tool. In order to evaluate abnormal results, normal ranges need to be fully developed. Although a number of studies have described normal ranges, none have investigated the effect of the age of the subject on these results. This study was undertaken to assess whether there are age-related differences in sputum cell differential cell counts in a population of normal, healthy volunteers. STUDY DESIGN AND PARTICIPANTS: Induced sputum samples were obtained from 66 healthy, nonsmoking subjects (24 men) with a mean age of 44 years (age range, 18 to 74 years). Differential cell counts were related to age. RESULTS: Sputum neutrophil counts were found to correlate significantly with the age of the volunteers (r = 0.58; p < 0.001). Macrophage counts showed a proportionate, inverse correlation with increasing age (p < 0.01), but no correlation was seen for any other cell type. On subanalysis according to age range, the mean neutrophil differential increased from 26.9% (SD, 19.8%) [17 patients] in the group of patients who were 0 to 29 years of age to 68.5% (SD, 20.6%) [11 patients] in the group of patients who were > 60 years of age. CONCLUSION: In our healthy volunteer population, the induced sputum differential neutrophil count increased significantly with age. These findings highlight the need for age matching in controlled studies.