Abstract Introduction Concerns about parents with minoritized sexual identities often focus on the belief that their children will be confused about their gender and report a non-heterosexual orientation compared to children reared by heterosexual parents. Yet, few longitudinal studies exist. Methods Gender identity, gender expression, sexual orientation, and sexual experiences were examined in 75 U.S. donor-conceived offspring (39 assigned females at birth (AFAB) and 36 assigned males at birth (AMAB)) of lesbian parents, when the offspring had reached adulthood (ages 30–33). Additionally, 72 of these offspring (38 AFAB and 34 AMAB) had also completed surveys in adolescence (age 17, data collected 2004–2009) and emerging adulthood (age 25, data collected 2012–2017), which enabled us to examine the developmental pathways of their sexuality. Results All AMAB offspring and 94.7% of AFAB offspring who identified as cisgender during adolescence continued to do so during emerging adulthood and adulthood. Over time, sexual orientation was more fluid than gender identity, and AFAB offspring were more fluid than AMAB offspring. Specifically, considering those who reported the same (heterosexual/straight; lesbian, gay/homosexual; or bisexual+) sexual orientation from adolescence through emerging adulthood to adulthood, 63.9% were AFAB and 82.4% were AMAB. More than half of AFAB offspring and 80.6% of AMAB offspring identified as heterosexual in adulthood, and the vast majority had had sex with a non-transgender man (86.5%) and a non-transgender woman (93.6%), respectively, in the last 5 years. Conclusions This is the only study that has followed the biological offspring of lesbian parents from birth to adulthood, prospectively and longitudinally. The results indicate that offspring of lesbian parents are less likely to identify as transgender than the general public, but more likely to identify as LGB or queer. Policy Implications As gender and sexual identity development significantly impacts well-being, creating supportive environments for offspring of lesbian parents and increasing public awareness of the connections among developmental milestones, health, and thriving are vital.
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