Contains the following essays: Dominance, Testosterone and Psychological Sex Differences: The Social Identity of Men: Locating the Central Role of Self-Esteem in Men’s Attitudes towards Men and Women: The Psychology of Aspirations to Top Management: Does Gender Identity Matter?: Perspectives of Gender-role Identity in Mental Health: A Review Focusing on the Japanese Cultural Aspects: Boys Performing Masculinities: Exploring Gender and Sexual Identity in Nurse Led Boys Groups: Absent Signs, Elusive Experience. On Young Gay Men and Abstence of Adequate Signs and Cultural Images: Gender Identity at Home: Comparing the Role of Househusband to Housewife: Biology, Gender and Behaviour. A Critical Discussion of the Biological Models used for Explaining Cognitive and Behavioural Gender Differences: Gender Group Identity as a Moderator of Sex Differences in Interpersonal and Intergroup Dominance.