@article{Lewis2017,
author = {Lewis, R. and Tanton, C. and Mercer, C.H. and Mitchell, K.R. and Palmer, M. and Macdowall, W. and Wellings, K.},
title= {Heterosexual practices among young people in Britain: Evidence from three national surveys of sexual attitudes and lifestyles},
year = {2017},
doi = {10.1016/j.jadohealth.2017.07.004},
volume = {61},
number = {6},
pages = {694--702},
}