The master's thesis presents a review of the literature regarding attachment styles, fear of intimacy, and sociosexual orientation. In the theoretical part, the author defines the theory of attachment, along with attachment styles and its change or transfer. At this point the author explains intimacy as an interaction in the interpersonal process, depicts fear of intimacy, components of sociosexual orientation, and highlights gender differences in intimacy. The theoretical framework was followed by the empirical section including a quantitative method of data analysis. Verifications of attachment style, fear of intimacy, and level of sociosexual orientation were carried using the Relationship Questionnaire (RQ), FIS (Fear of Intimacy) Questionnaire, and SOI-R (The revised Sociosexual Orientation Inventory) Questionnaire. The questionnaire was completed by 561 respondents, of which 105 were men and 456 women. The research suggests that most respondents have a fearful-avoidant (disorganized) attachment style (40.6 %), followed by individuals with a secure attachment style (30.8 %), a fifth of the individuals with an anxious-preoccupied attachment style (20.9 %) and a minority of individuals who have a dismissive-avoidant attachment style (7,7 %). On top of that the research indicated that 60.25 % of respondents have low fear of intimacy while 39.75 % of the respondents have high fear of intimacy. In terms of sociosexual orientation, the results showed that 79.9 % of respondents have restrictive sociosexual orientation and 20.1 % are permissively sociosexual oriented. The analysis showed that there is a statistically positive correlation between fear of intimacy and sociosexual orientation. Individuals with a unsecure attachment style have, on average, a higher level of intimacy fear than individuals with a secure attachment style. The research also suggests that there are statistically significant differences between men and women regarding sociosexual orientation. There are also statistically significant differences between men and women in terms of intimacy fear. There is also a positive correlation between fear of intimacy and permissive sociosexual orientation.