In recent years there has been increasing awareness of the part played by homosexual behaviour in the spread of venereal diseases. No doubt some European countries, their laws being based on the Napoleonic Code of 1810, in which questions of fornication and homosexuality were left to the conscience of the individual (West, 1968), had early recognized the phenomenon of variations from heterosexu...

BACKGROUND Epidemiological studies suggest that allogeneic immunity may inhibit HIV-1 transmission from mother to baby and is less frequent in multiparous than uniparous women. Alloimmune responses may also be elicited during unprotected heterosexual intercourse, which is associated ex vivo with resistance to HIV infection. METHODOLOGY/PRINCIPAL FINDINGS The investigation was carried out in w...

Recent imaging studies have shown that brain morphology and neural activity during sexual arousal differ between homosexual and heterosexual men. However, functional differences in neural networks at the resting state is unknown. The study is to characterize the association of homosexual preference with measures of regional homogeneity and functional connectivity in the resting state. Participa...

Classic immune thrombocytopenia purpura (ITP) occurs predominantly in women and is associated with either normal or impaired Fc receptor-mediated clearance of antibody-coated cells. Recently, an increasing incidence of thrombocytopenia has been observed in homosexual men, but whether Fc receptor-mediated clearance of antibody-coated cells is normal or impaired in these men is unknown. To study ...

Career Lesbians: Getting Hired for Not Having Kids? Using a field experiment, we investigate whether discrimination based on women’s sexual orientation differs by age and family constraints. We find weakly significant evidence of discrimination against young heterosexual women. This effect is driven by age (and fertility) rather than by motherhood. We do not find any unequal treatment at older ...

OBJECTIVES To examine changes in sexual behaviour among London homosexual men between 1998 and 2003 by type and HIV status of partner. METHODS Homosexual men (n=4264) using London gyms were surveyed annually between 1998 and 2003 (range 498-834 per year). Information was collected on HIV status, unprotected anal intercourse (UAI) in the previous 3 months, and type of partner for UAI. High ris...

One of the key behavioral effects of attractiveness is increased visual attention to attractive people. This effect is often explained in terms of evolutionary adaptations, such as attractiveness being an indicator of good health. Other factors could influence this effect. In the present study, we explored the modulating role of sexual orientation on the effects of attractiveness on exploratory...

Previous research has shown that lay people can accurately assess male sexual orientation based on limited information, such as face, voice, or behavioral display. Gender-atypical traits are thought to serve as cues to sexual orientation. We investigated the presumed mechanisms of sexual orientation attribution using a standardized set of facial and vocal stimuli of Czech men. Both types of sti...

OBJECTIVES The current study was designed to test a neurohormonally based theory of sexual orientation and preferred partner characteristics in homosexual men. The theory holds that the brains of homosexual men are masculinized and feminized directing attraction to targets younger and more masculine than self, and the brains of homosexual adolescents are incompletely masculinized and feminized ...

To assess whether the spread of infection with HIV can be reduced by changes in behaviour among groups most at risk because of their sexual practices sexual behaviour was monitored among 1050 homosexual men tested for HIV infection at a genitourinary medicine clinic in west London from November 1984 to September 1987. Four cohorts, defined by date of presentation, were studied by questionnaire ...