Babchishin Kelly M, Holmes Emma J, Banse Rainer, Huppertz Lisa, Seto Michael C
Department of Psychology, Carleton University, Ottawa, Ontario, Canada.
Department of Psychology, Universität Bonn, Bonn, North Rhine-Westphalia, Germany.
PLoS One. 2024 Dec 3;19(12):e0314550. doi: 10.1371/journal.pone.0314550. eCollection 2024.
Sibling sexual behaviour, despite historical and cross-cultural incest taboos and biologically driven incest avoidance, poses a persistent problem. We tested factors theorized to be associated with sibling incest in a cross-sectional online survey of 1,863 respondents with siblings mainly from North America and Germany. We found that 13% of participants reported engaging in sexual contact with a sibling, typically starting at the age of 10, and that step-siblings and half-siblings were more likely to engage in sibling incest than full siblings. Curiosity and games were the primary motivators; being coerced was more prevalent among female and younger participants. The study underscores both individual (e.g., impulsivity, concurrent childhood sexual behaviour problems) and family level factors (e.g., presence of step-sibling, positive attitudes toward nudity, sexual abuse by parent) influencing liability to engage in sexual behaviours with a sibling. Findings were robust across English- and German-speaking participants, suggesting our results are generalizable. Professionals addressing problematic child sexual behaviour should assess for concurrent sibling incest, and evaluate positive family attitudes towards nudity, sexual abuse by parents, and reduced disgust to sibling incest as potential risk factors for sibling incest. The findings stress the need for comprehensive sexual education in blended households, where age gaps and diminished genetic relatedness contribute to sibling sexual behaviour.
尽管存在历史和跨文化的乱伦禁忌以及生物学上驱使的乱伦回避，但兄弟姐妹间的性行为仍是一个持续存在的问题。我们在一项针对1863名主要来自北美和德国且有兄弟姐妹的受访者的横断面在线调查中，对理论上与兄弟姐妹乱伦相关的因素进行了测试。我们发现，13%的参与者报告曾与兄弟姐妹发生性接触，这种情况通常始于10岁，而且继兄弟姐妹和同父异母或同母异父的兄弟姐妹比亲兄弟姐妹更有可能发生乱伦行为。好奇心和游戏是主要动机；在女性和年轻参与者中，被迫发生性行为的情况更为普遍。该研究强调了个体因素（如冲动性、童年期同时存在的性行为问题）和家庭层面因素（如继兄弟姐妹的存在、对裸体的积极态度、父母的性虐待）对与兄弟姐妹发生性行为倾向的影响。研究结果在说英语和说德语的参与者中都很可靠，这表明我们的结果具有普遍性。处理有问题的儿童性行为的专业人员应评估是否同时存在兄弟姐妹间的乱伦行为，并将家庭对裸体的积极态度、父母的性虐待以及对兄弟姐妹乱伦的厌恶感降低视为兄弟姐妹乱伦的潜在风险因素进行评估。研究结果强调了在混合家庭中进行全面性教育的必要性，因为年龄差距和基因关联性降低会导致兄弟姐妹间的性行为。
