TY - JOUR A1 - Twenge, J.M. A1 - Sherman, R.A. A1 - Wells, B.E. T1 - Sexual inactivity during young adulthood is more common among U.S. Millennials and iGen: Age, period, and cohort effects on having no sexual partners after age 18 Y1 - 2017 DO - 10.1007/s10508-016-0798-z VL - 46 ER -