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Biopsychosocial predictors of risky sexual behaviours among the gay men in the UKYadegarfard, Mohammadrasool (University of BedfordshireUniversity of Bedfordshire, 2020-10)Introduction: The prevalence of human immunodeficiency viruses and sexual transmitted infections is higher among gay men than in any other demographic group. In many cases, the spread of sexual transmitted infections is only due to risky sexual behaviours. Risky sexual behaviour is an ongoing issue that has no absolute answer, the results of studies conducted on risky sexual behaviours just ten years ago might not be in line with the results of studies carried out today. In an attempt to support this, the current researcher tried to answer one main question: why do gay individuals subsequently choose to engage in risky sexual behaviours? Methodology: The researcher conducted three studies in two stages using a multiphase mixed methods research design, consisting of a mixed method in the first stage and a quantitative study in the second stage. In the three studies, a total of 803 gay and heterosexual men participated. The study includes five comparison studies between gay and heterosexual men in two stages. Results: Study one (qualitative): A qualitative study was conducted in parallel with the quantitative study in stage one .The key themes that emerged as contributing factors to risky sexual behaviours and unsafe sex were: Beliefs and attitude towards RSBs and gay men; Identity and internalized homophobia; childhood experiences, age, substance use; attachment; well-being. From analysing the data, it appeared that all these areas of an individuals’ life influence their sexual behaviours. However, most of the factors seemed to be linked and overlapped on each other and identifying one factor without considering other factors was not completely possible. Study two (quantitative): It was found that the studied criteria predicted RSB only for the heterosexual respondents and did not predict RSB among the gay participants. Nevertheless, among the gay respondents, sexual hyperactivation was found to be predicted by substance use and loneliness. It is concluded that gay males who experience subjective loneliness, smoke and sniff substances for recreational purposes report higher levels of sexual hyperactivation. However, higher sexual hyperactivation was not found to be a predictor of sexual relationships or RSB per se. Study three (quantitative): Based on the findings from stage one, the third study was conducted. The third study was included three hypotheses that were partly supported by the results of hypothesis testing. The results showed that there are more similarities between gay and heterosexual men than differences and, the differences that do exist are in individuals’ life experiences, which are the results of society’s different responses to and treatment of gay and heterosexual men. Discussion: The researcher believes that this current study is unique in its field and the outcomes contributed to the existing knowledge and understanding of RSBs among men. The multiphase mixed method design used in this study gave the researcher a comprehensive view of the subject. It allowed the researcher to measure a number of variables. The TPB was found to be a helpful model for understanding RSBs. The implications of the findings are discussed in the last chapter.