Abstract
The formation and development of romantic relationships continues to be an important area of study among adolescent and young adult populations. Although many adolescents and young adults report having committed romantic relationship experiences, which may or may not include sexual activity, research has grown during the past decade to study a variety of sexual experiences and relationship types. Consistent with identity formation and exploration and the opportunity for experimentation, adolescents and young adults also engage in a variety of casual sexual relationships and experiences. The past decade saw a dramatic growth in the study of casual sex and in particular hooking‐up experiences. Furthermore, scholars have begun to examine more fully young adults’ attitudes toward and willingness to engage in consensually nonmonogamous relationships; however, little research has examined actual involvement in consensually nonmonogamous relationships among those in young adulthood. As with previous decade reviews, ongoing attention regarding how adolescent experiences serve to inform relationships and sex during the period of young adulthood is warranted. Directions for future research are identified and discussed.