Introduction: Swinging is a relatively new phenomenon in Poland. Due to this reason, a number of ethical and psychological questions have grown around the issue. The aim of the following research is to investigate the effects of jealousy on the people involved in swinging Material and Methods: The 49 people involved in exchanging partners have been examined. Only 28 of them met the proper criteria of swinging. The research used the author’s own questionnaire concerning jealousy Results: Most of the participants involved in swinging, regardless of their gender, feel jealous of their partner (60.7%) and know that he/she also feels the same (75.0%). Furthermore, a significant number of participants declare that knowing that their partner is jealous gives them pleasure (53.6%). Conclusions: The group of Polish swingers is no different from the group of swingers described in the studies carried out abroad in terms of disclosure and understanding of jealousy