@article{ref1,
title="Greater frequency of penile-vaginal intercourse without condoms is associated with better mental health",
journal="Archives of sexual behavior",
year="2010",
author="Costa, Rui Miguel and Brody, Stuart",
volume="39",
number="1",
pages="1-2; author reply 3",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0004-0002",
doi="10.1007/s10508-009-9519-1",
url="http://dx.doi.org/10.1007/s10508-009-9519-1"
}