Based on the present study, we aimed to investigate the subjective experience of fatherhood and masculinity of primiparous fathers during their transition to fatherhood. To this end, an extensive research was conducted that was divided into two articles. The first one, Subjective experience of masculinity in the transition to fatherhood discusses how fathers experience changes in masculinity during their transition to fatherhood. The second article, The contemporary father: vicissitudes of the process of becoming a father focuses on how fathers experience the process of transition to fatherhood. To this end, two qualitative studies were conducted by interviewing eight primiparous men from Rio de Janeiro who belong to the middle -class, have a child aged between eight months and three years, are heterosexual and are married (formally or otherwise). The results were analyzed according to the content analysis method and its categorical aspect. To achieve the set goals, analysis categories were discussed in articles one and two as follows: the categories of the first article were Masculinities in transformation: identifications and ruptures with parents; Male identity: the issue of gender; and Feminism and its reverberations on masculinity. The categories of the second article were Prehistory of fatherhood: the desire to have children; Repercussions of parenting on the marital relationship and Paternal involvement. Most participants believe that today, there is a greater fluidity between the male and the female gender, which also reverberates on parenting and conjugality and makes them more egalitarian. Their statements reveal increased paternal involvemen t throughout the entire process of becoming a father, from planning and desiring a child to physical and emotional care. It was further observed that parenting also impacts the marital relationship, as issues related to the parental subsystem seem to affect the conjugal one as well.