Following previous studies, chronotype was related to sexual attitudes and behavior. Evening people tend to be more promiscuous and follow short-term mating strategies and extra-pair matings (EPM), which might lead to a higher reproductive success. In this study, one aim was to assess reproductive success directly by asking for children, and, second, to obtain a higher sample size for the analysis of sexual behavior and chronotype than in previous studies. N = 1,843 heterosexual persons (551 men, 1,288 women, 4 without data) responded to our online survey. Five hundred fifty-nine persons were single and 1,281 in a relationship; 203 reported having children (1.9 ± 0.81). Age was positively related and age at first intercourse was negatively related to the number of children. People being later chronotypes had fewer children, and shorter sleep duration was linked with more children. Extroversion was correlated with number of children, as was the long-term relationship orientation. Sociosexual orientation and EPM were unrelated to number of children. Age at first intercourse was earlier in evening people, and unrestricted sociosexuality was higher in late chronotypes. Morning orientation correlated with long-term relationship orientation and eveningness with short-term relationship orientation. Number of sexual partners was lower in morning people. Men were more evening oriented, later chronotypes, and slept shorter. There were no differences in sociosexual behavior, but men were less restricted in attitude and desire. Men scored higher on short-term relationship orientation and women higher on long-term relationship orientation. This study confirmed previous results about chronotype and sexual behavior but provided the first evidence that morningness was related to higher reproductive success.

中文翻译：

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异性恋者的生殖成功、关系取向和性行为：与时间型、睡眠和性的关系。

根据之前的研究，时间型与性态度和行为有关。夜猫子往往更加混杂，遵循短期交配策略和配对外交配（EPM），这可能会带来更高的繁殖成功率。在这项研究中，一个目的是通过询问孩子来直接评估生殖成功率，第二个目的是获得比以前的研究更大的样本量来分析性行为和睡眠类型。N = 1,843 名异性恋者（551 名男性，1,288 名女性，4 名无数据）对我们的在线调查做出了回应。559 人是单身，1,281 人处于恋爱关系；203 人报告有孩子 (1.9 ± 0.81)。年龄与孩子数量呈正相关，首次性交年龄与孩子数量呈负相关。睡眠时间型较晚的人生育的孩子较少，睡眠时间较短与孩子较多有关。外向性与孩子数量相关，长期关系取向也是如此。社会性取向和 EPM 与孩子数量无关。晚睡型的人首次性交的年龄较早，而晚睡型的人的不受限制的社会性行为则较高。早晨取向与长期关系取向相关，晚上取向与短期关系取向相关。早起的人的性伴侣数量较少。男性更倾向于晚上，睡眠时间更晚，睡眠时间也更短。社会性行为没有差异，但男性在态度和欲望方面受到的限制较少。男性在短期关系取向上得分较高，女性在长期关系取向上得分较高。这项研究证实了之前关于时间型和性行为的结果，但提供了第一个证据表明早晨与更高的繁殖成功率相关。