The health of transgender adolescents (i.e., those identifying with a gender other than their sex assigned at birth) is gaining attention from researchers, yet little work has examined normative sexual behaviors among this population. Self-identified gender minority adolescents, including those identifying as trans boys, trans girls, nonbinary, and questioning their gender identity (age range 14-18, Mage = 16, n = 1,223) from all 50 U.S. states responded to anonymous online surveys. Participants reported on their age of initiation and number of sexual partners for four sexual behaviors ranging in intimacy (i.e., sexual touching, oral sex, vaginal sex, and anal sex). Participants also indicated the gender of their sexual partners and experiences with sexually transmitted infections (STIs), STI tests, and pregnancy. Overall, transgender adolescents' age of initiating sexual behaviors and number of sexual partners are similar to those observed in prior studies of cisgender adolescents. No differences were found between gender identity subgroups on ever engaging, age of initiation, number of partners, and gender of partners across the four sexual behaviors, with some exceptions for anal sex. Participants reported low rates of STIs and pregnancy, but also low rates of STI testing. Implications for sex education and health care are discussed.