Mustanski Brian, Viken Richard J, Kaprio Jaakko, Winter Torsten, Rose Richard J
Department of Psychological and Brain Sciences, Indiana University, USA.
Health Psychol. 2007 Sep;26(5):610-7. doi: 10.1037/0278-6133.26.5.610.
With behavior genetic analyses of data from young adult twins, we evaluated theoretical perspectives that differentially emphasize biological dispositions, social/cultural factors, or universal pathways to explain individual differences in sexual behaviors.
We fit biometric sex limitation models to three aspects of sexual behavior reported by 4,925 Finnish twins ages 23-27.
From a postal questionnaire, we obtained self-report information on initiation/abstinence of sexual intercourse, onset age, and number of sexual partners.
Genetic and non-shared environmental influences were significant for all three measures. There were trends for common environmental influences on initiation and, in females, age at first intercourse. Some differential effects in males and females were found. Results comparing onset age and number of partners among experienced twins from pairs concordant and discordant for initiation found genetic and environmental influences on initiation/abstinence overlapped those found for the other aspects of sexual behavior.
These results document genetic variation in individual differences in sexual behavior of young adults. Incorporating genetic dispositions into integrated models of sexual behavior will facilitate more effective health promotion and risk taking intervention.
通过对年轻成年双胞胎数据进行行为遗传学分析，我们评估了不同强调生物倾向、社会/文化因素或通用途径来解释性行为个体差异的理论观点。
我们将生物特征性别限制模型应用于4925名年龄在23 - 27岁的芬兰双胞胎报告的性行为的三个方面。
通过邮政问卷，我们获得了关于首次性交/禁欲、开始年龄和性伴侣数量的自我报告信息。
遗传和非共享环境影响对所有三项指标均有显著影响。在首次性交以及女性的首次性交年龄方面存在共同环境影响的趋势。在男性和女性中发现了一些差异效应。对在首次性交方面一致和不一致的双胞胎对中经验丰富的双胞胎的开始年龄和伴侣数量进行比较的结果发现，遗传和环境对首次性交/禁欲的影响与性行为其他方面的影响重叠。
这些结果证明了年轻成年人性行为个体差异中的遗传变异。将遗传倾向纳入性行为综合模型将有助于更有效的健康促进和风险干预。
