Background: Life expectancy of people living with HIV (PLWH) is increasing. Effective biomedical prevention methods (treatment as prevention and preexposure prophylaxis) are being widely implemented in high-income nations. Therefore, research into quality of life, including sexual adjustment, is of increasing importance to HIV care. Yet, sexual adjustment of PLWH has been neglected in past research. We propose a new model of sexual adjustment to HIV which explores the dynamic process, facilitators and barriers characterising sexual life of PLWH overtime.Method: Thirty PLWH (19 male, 11 female) recruited from two HIV treatment centres as well as community groups, completed semi-structured interviews which were audio-recorded and transcribed verbatim for analysis using grounded theory.Results: The model of sexual adjustment to HIV is the first to establish how undue fears of transmission of HIV during sex and/or fear of rejection by sexual partners determine initial sexual behaviour after diagnosis and also sexual adjustment over time. Within the model, sexual adjustment to HIV is facilitated by factors which assist PLWH to overcome such fears, including: partner acceptance, peer, community and health professional support, and accurate knowledge of risk of transmission including of undetectable viral load and pre-exposure prophylaxis. Adjustment is inhibited when undue fears of transmission and of rejection persist long term, resulting in maladaptive behaviours to cope with such fears including avoidance of sex and problematic drug and alcohol use. Conclusion: This model offers clear directions for promoting sexual adjustment to HIV. Health professionals should: (a) assess and intervene for sexual quality of life (not just risk) among PLWH; (b) be aware that serosorting facilitates adjustment in the short to medium term, but may interfere with adjustment long-term, (c) promote opportunities for positive connection between PLWH, and (d) intervene directly with PLWH and HIV negative sexual partners to promote accurate risk of transmission knowledge, including how this applies to their own sexual practices, and whether they are experiencing undue fear of transmission over time.