In this first investigation of Taiwanese sexual behaviors in the United States, 144 Taiwanese students completed an online anonymous survey. Demographics, health belief model (HBM) constructs, and acculturation were examined as predictors of sexual behaviors over the last year. Analyses indicated that participants who reported a higher number of sexual partners and more frequent sexual intercourse tended to be more educated and more likely to be nonheterosexual. The HBM constructs, as a set, reliably predicted participants' sexual behaviors. Self-efficacy was the strongest predictor within the HBM. Furthermore, acculturation moderated the predictive power of the HBM with respect to intercourse frequency. The main limitation of the study is that the measure of HBM, which was not designed to target Asian immigrants, was psychometrically poor. The results suggest self-efficacy is a target for behavioral change, acculturation may need to be incorporated into the HBM, and more culturally sensitive measures need to be developed.