No abstract

A sample of 1,784 individuals responded to an online survey advertised on the Facebook social networking website. We explored the sexual orientation continuum by focusing on three components: self-reported sexual orientation identity, sexual attraction, and sexual partners. Results supported a 5-category classification of identity (heterosexual, mostly heterosexual, bisexual, mostly gay/lesbian, gay/lesbian) in that two added identity labels (mostly heterosexual and mostly gay/lesbian) were frequently chosen by participants and/or showed unique patterns of attraction and partners, distinct from their adjacent identities (heterosexual and bisexual, and bisexual and gay/lesbian, respectively). Those who reported an exclusive label (heterosexual, gay/lesbian) were not necessarily exclusive in other components; a significant minority of heterosexuals and the majority of gays/lesbians reported some attraction and/or partners toward their nonpreferred sex. The five identity groups differed in attraction and partners in a manner consistent with a continuous, rather than a categorical, distribution of sexual orientation. Findings also supported a sexual orientation continuum as consisting of two, rather than one, distinct dimensions (same- and other-sex sexuality). Having more same-sex sexuality did not necessarily imply having less other-sex sexuality, and vice versa. More men than women were at the exclusive ends of the continuum; however, men were not bimodally distributed in that a significant minority reported nonexclusivity in their sexuality.

We reviewed whether mostly heterosexuals, a sexual orientation group characterized by a small amount of same-sex sexuality, differ from heterosexuals and bisexuals on a variety of mental and physical health outcomes (e.g., internalizing problems, body dissatisfaction and disordered eating, obesity, sexual/reproductive health, physical health), health risk behaviors (e.g., substance use, sexual risk taking), and risk and protective factors (e.g., victimization, stressful/risky environment, socioeconomic status, personal and social relationships, gender nonconformity). A narrative and quantitative literature review was conducted of 60 papers covering 22 samples from five Western countries. Individual, mean, and median effect sizes (Cohen ds) were calculated whenever possible. Mostly heterosexuals reported higher levels of risk in most reviewed outcomes compared to heterosexuals (unweighted mean effect sizes ranged from 0.20 to 0.50) but typically somewhat lower than bisexuals (unweighted mean effect sizes ranged from -0.10 to -0.30). Various risk factors frequently reduced, but rarely eliminated, health disparities between mostly heterosexuals and heterosexuals. Findings are discussed through the lens of three potential explanations of elevated health risks among nonheterosexuals: minority stress, nonheterosexual lifestyles, and common causes. Because data on many outcomes were scarce or missing, particularly for men and in comparison with bisexuals, further research is needed.

Engagement in casual sex (or hooking up) is generally feared to have negative well-being consequences; however, empirical evidence is inconclusive, pointing toward potential moderators. Using self-determination theory (SDT), we hypothesized that well-being following hookups would depend on the type and level of motivation for hooking up. A university-wide sample of 528 undergraduates completed online surveys at the beginning (T1) and end (T3) of one academic year. After controlling for demographics, personality traits (i.e., neuroticism and extraversion), prior casual and romantic sex, and T1 well-being, having genital hookups between T1 and T3 for non-autonomous reasons (i.e., due to self-imposed pressures, external contingencies and controls, or complete lack of intentionality) was linked to lower self-esteem, higher depression and anxiety, and more physical symptoms. Autonomous hookup motivation (i.e., emanating from one's self) was not linked to any outcomes. Compared to peers without hookups, those with high non-autonomy in their hookups typically had inferior well-being; this was not true of those with low non-autonomy hookups. Gender differences, implications for SDT and casual sex research, and implications for educational programs and clinical work are discussed.

Currently, little is known about heterosexually identified individuals who nonetheless acknowledge same-sex interests. To address this shortcoming, the prevalence of same-sex attractions, fantasies, and experiences among heterosexually identified college students was examined, as well as differences between those who are exclusively heterosexual in their interests and those who are nonexclusive because they report some same-sex attractions or fantasies. Students (N = 243) at a large, Northeastern university completed an online survey providing information about their sexual orientation identity; same- and other-sex attractions, fantasies, and behaviors; and demographic, sexual history, and sexual attitudes variables. Compared to exclusive heterosexual women, nonexclusive women were more liberal in their political and sexual attitudes and had greater sexual experience. Nonexclusive men were virtually indistinguishable from exclusive heterosexual peers on assessed variables. Results are discussed in terms of implications for the nature and meaning of non-heterosexuality in contemporary Western society.