To What Extent are Prenatal Androgens Involved in the Development of Male Homosexuality in Humans?

Examining the Fraternal Birth Order Effect and Sexual Orientation: Insights from an East European Population

The development of human sexual orientation remains a complex and multifaceted subject. It is often studied but its origins continue to elude us. In this preregistered study, our primary objective was to demonstrate the fraternal birth order effect (FBOE), which assumes a higher prevalence of older brothers in gay men than in their straight counterparts and which has also been recently recorded in lesbian women. Our second aim was to explore any potential impact of the FBOE on anal-erotic role orientation (AERO), both in gay and straight men. Our study sample included 693 gay men, 843 straight men, 265 lesbian women, and 331 straight women from Czechia and Slovakia. Employing a conventionally parameterized logistic regression model, we substantiated the FBOE among both gay men (OR = 1.35 for maternal older brothers) and lesbian women (OR = 1.71). These outcomes were confirmed by a more nuanced parameterization recently proposed by Blanchard (2022). Nonmaternal older brothers did not exhibit a significant influence on their younger brothers' sexual orientation. Contrary to some earlier reports, however, our data did not establish the FBOE as exclusive to gay men with the receptive AERO. Furthermore, our observations indicated a lower offspring count for mothers of gay men compared to mothers of straight men. Emphasizing the positive FBOE outcomes, we acknowledge the need for caution regarding the various options that can be used to estimate the familial influences on sexual orientation.

Twinks, Fairies, and Queens: A Historical Inquiry into Effeminate Gay Bottom Identity

Effeminate gay bottoms, or gender nonconforming men who are anally receptive and/or give oral sex to other men who are also "gender nonconforming," are persistently marginalized in gay and LGBTQ+ communities in Britain and the US. For some LGBTQ+ commentators, "twink" has become relexified to mean a young-looking, slim, hairless effeminate bottom, whereas originally the term primarily denoted a body type and age bracket among gay men. This article explores how the twink has come to bear connotations of effeminacy and bottom subjectivity, highlighting the steady erosion of other available cultural terms to denote a bottom whose gender expression does not conform to dominant cultural masculine stereotypes. It offers an analysis of two key historical effeminate bottom identities in Britain and the US, the "fairy" and "queen," and argues that the twink not only now carries connotations originally attached to these historical identities, but that it merges their gendered and sexual connotations with new characteristics concerning age and body type that may cause considerable anxiety among contemporary gay men due to their unsustainable "shelf life."

Retracted: Sexual orientation, neuropsychiatric disorders and the neurotransmitters involved

This article has been retracted: please see Elsevier Policy on Article Withdrawal (http://www.elsevier.com/locate/withdrawalpolicy). This article has been retracted at the request of the Editor in Chief of Neuroscience and Biobehavioral Reviews after concerns were raised with respect to the phrasing of comparisons drawn between humans and animal models. These comparisons were deemed unsupportable, and thus in the best interests of publication standards the Editor has concluded it is necessary to retract the paper. The authors disagree with the reason for the retraction.