Sexual Fluidity in Identity and Behavior Among Cisgender Youth: Findings from the Longitudinal Growing up with Media Study.

Objectives: To examine fluidity in sexual orientation identity and behavior among cisgender youth.

Study Design: Data were analyzed from 5 survey waves of the longitudinal US Growing Up with Media Study (2010-2019). Participants were 989 cisgender youth, aged 13-20 years at baseline, who completed online surveys assessing sexual orientation identity and behavior (gender of sexual partners). Amount of change (mobility) and patterns of change across waves were assessed for identity and behavior.

Results: Consistently heterosexual was the most common sexual orientation identity (89%-97% for boys, 80%-90% for girls), followed by gay (3%) for boys, and bisexual (8%) for girls. Sexual minority identities increased (3%-11% for boys, 10%-20% for girls) over time, same-gender sexual behavior also increased. Girls had more identity mobility than boys; no gender difference was found for behavior mobility. Movement from heterosexual to a sexual minority identity occurred for 9% of girls and 6% of boys; movement from different-gender sexual behavior to same-gender sexual behavior occurred for 2% of girls and boys.

Conclusions: Findings highlight the need to assess multiple dimensions and patterns of change of youth sexual orientation in research and clinical care. Recognizing and creating space for conversations about changes in sexual identity and behavior over time will help providers accurately and effectively address the health needs of all patients.