Sex researchers have primarily focused on first penile-vaginal sex and negative consequences. However, because sexual behaviors and attitudes change with age, sex-related consequences may also change. In this study, 275 college students reported on penile-vaginal sex-related consequences the prior day in 733 daily diaries across two or more semesters. Participants were primarily female (63%) and heterosexual (98%). The sample was racially and ethnically diverse, with 30% identifying as Hispanic and, of the non-Hispanic participants, 35% White, 24% Black/African American, 20% Asian-American/Alaskan Native, 2% American Indian, and 2% Hawaiian/Pacific Islander. During their first semester, participants were, on average, 18.4 years old (SD = 0.4). Latent class analysis identified three classes: High Positive (56%), Intimacy and Satisfaction Only (34%), and Moderate Positive With Health Concerns (10%). Over time, students were likely to transition out of the Moderate Positive With Health Concerns and High Positive classes, and into the Intimacy and Satisfaction Only class. The findings suggest that discussing protection from health concerns and positive aspects of sexuality may lead to better student engagement in safe sex programming.

性研究人员主要关注第一次阴茎​​-阴道性行为和负面后果。然而，由于性行为和态度随着年龄的增长而改变，与性有关的后果也可能发生变化。在这项研究中，275 名大学生在两个或多个学期的 733 份日常日记中报告了前一天与阴茎-阴道性行为相关的后果。参与者主要是女性 (63%) 和异性恋者 (98%)。样本具有种族和民族多样性，30% 被确定为西班牙裔，在非西班牙裔参与者中，35% 是白人，24% 是黑人/非裔美国人，20% 是亚裔美国人/阿拉斯加原住民，2% 是美洲印第安人，2% % 夏威夷/太平洋岛民。在第一学期，参与者的平均年龄为 18.4 岁（SD = 0.4）。潜在类别分析确定了三个类别：高度积极 (56%)、仅亲密和满意 (34%) 以及健康问题中度积极 (10%)。随着时间的推移，学生可能会从“中度积极与健康问题”和“高度积极”课程过渡到“亲密感”和“仅满足感”课程。研究结果表明，讨论保护免受健康问题和性行为的积极方面可能会导致学生更好地参与安全性行为计划。