Studies indicate that parents of children with autism spectrum disorder (ASD) face significantly higher levels of stress compared to other parents of children with developmental disabilities - due to the heterogeneity of diagnoses and specific comorbidities (Saini et al., 2015), as well as the severity of symptoms and costs associated with treatments and education (Ilias et al. 2018). In addition to the stress directly related to having a child with ASD, parents often report a reduced quality of marriage and family functioning (Harper et al., 2013; Scorgie and Sobsey, 2000). Qualitative methods are rarely used in the field of research on intimate relationships of parents of children with ASD. A few studies have only partially examined how couples cope with stress together (e.g. Downes et al., 2021). Also, in research, parents of adults with ASD are examined much less often, although some findings indicate that marital satisfaction among parents of children with ASD decreases as the child grows up. The aim of this qualitative research was to gain insight into the experience of the association between stress and the quality of intimate relationships among parents of adults with ASD. Special emphasis is placed on the examination of the experience of coping with stress and the consequences of stress for the intimate relationship, and on the description of differences between the sexes. The research was conducted as part of the project "Providing support to adults with autism spectrum disorder" realized in collaboration between Faculty of Education and Rehabilitation Sciences and Brigham Young University (BYU). The results of the work were obtained by analysing the interviews of 11 respondents, i.e. parents of adults with autism spectrum disorder who have been in a relationship for at least 6 months and live in the same household. The research findings provide a deeper insight into the parental experiences of parents of adults with PSA. The thesis that parenting a child with PSA has a positive effect on some relationships, and a negative effect on others, depending on the intrinsic and extrinsic resources available to the family has been confirmed. Frequent changes in the nature of the relationship were observed, whereby the moment of learning the diagnosis turned out to be a turning point for the relationship. The most common ways of coping with parental stress are recognized, as well as certain gender-based differences. At the end, guidelines for practical work are available, which can be used as guidelines in providing comprehensive support to parents of children and adults with ASD.