"Controlling for a wide set of individual- and family-level observables available in the National Longitudinal Study of Adolescent Health, ordinary least squares (OLS) estimates show that sexually active adolescents have grade point averages that are approximately 0.2 points lower than virgins....

It is commonly believed that birth order is an important determinant of success. However, previous studies in this area have failed to provide convincing evidence that birth order is related to test scores, education, or earnings. Using data from the National Longitudinal Survey of Youth--1979,...