@article{Halpern2000,
author = {Halpern, C.T. and Joyner, K. and Udry, R. and Suchindran, C.},
title= {Smart teens don’t have sex (or kiss much either},
year = {2000},
doi = {10.1016/S1054-139X(99)00061-0},
volume = {26},
number = {3},
pages = {213--225},
}