The aim of the research was to examine the connection between the dimensions of attachment (anxiety and avoidance) with depression, depressive rumination, sociosexuality and aggressiveness, and to determine whether there is a connection between aggressiveness and depression and depression and sociosexuality, while checking for differences with regard to the gender and sexual orientation of the participants in all of the aforementioned variables and checking the contribution of the mentioned variables in the explanation of depression with regard to the sexual orientation of the participants. 389 participants of the student population took part in the research, who were categorized into members of the LGBT population (non-heterosexual participants, N=75) and heterosexual participants (N=305). The participants filled out the sociosexuality questionnaire (SOI-R), the shortened version of the Brennan Inventory in close relationships (ECRI) by Kamenov and Jelić, the short aggression questionnaire (ASQ), the depression subscale (SDD) and the depressive rumination scale (RRS). A significant positive association of the dimensions of attachment (anxiety and avoidance) with depression, depressive rumination, aggressiveness and sociosexuality was established, with a pronounced association of the dimensions of anxiety and depression. Significant positive associations between depression and aggression as well as depression and sociosexuality were also determined. In addition, gender differences were found in the dimension of avoidance, overall sociosexuality (and all its facets – desires, attitudes, behaviors) and in physical and verbal aggressiveness. Young men are sociosexually more non-restrictive, more avoidant and physically and verbally aggressive compared to girls. However, no significant gender differences were found in overall aggressiveness, anxiety dimension, depression and depressive rumination. Furthermore, as far as differences regarding sexual orientation are concerned, significant differences were found in total sociosexuality and all its facets (desires, attitudes and behaviors), anxiety, depression, depressive rumination and physical aggressiveness. Members of the LGBT population are sociosexually non-restrictive, more anxious, more depressed, significantly more prone to depressive rumination and physical aggression compared to heterosexual participants. Depressive rumination proved to be a positive significant predictor of depression in the subsample of heterosexual participants, while in the subsample of non-heterosexual participants (members of the LGBT population), depressive rumination and anger were positive significant predictors of depression. No significant contribution of the dimension of attachment, sociosexuality (with its facets concerning sexual behavior, attitudes and desires), overall aggressiveness and its three components (physical and verbal aggressiveness and hostility) in explaining depression in both heterosexual and non-heterosexual participants was found.