TY  - JOUR
PY  - 2014//
TI  - Substance Use and Sexual Intercourse Onsets in Adolescence: A Genetically Informative Discordant Twin Design
JO  - Journal of Adolescent Health
A1  - Deutsch, Arielle R.
A1  - Slutske, Wendy S.
A1  - Heath, Andrew C.
A1  - Madden, Pamela A. F.
A1  - Martin, Nicholas G.
SP  - 114
EP  - 116
VL  - 54
IS  - 1
N2  - PURPOSE: Using a genetically informed, discordant twin analysis, the objective of this study was to examine whether earlier onset of drinking and smoking behaviors predicted early sexual intercourse onset. METHODS: Over 3,400 adult same-sex twins from the Australian Twin Registry completed a structured interview that included retrospective reports on onsets of smoking, drinking, intoxication, and sexual intercourse and conduct disorder symptoms. A two-level frailty model estimated within-twin-pair and between-twin-pair comparisons. Onsets of smoking, drinking, drunkenness, and conduct disorder symptoms were estimated as sexual intercourse onset predictors. RESULTS: After controlling for conduct disorder, smoking and drinking onset did not predict sexual intercourse onset for either within-twin-pair or between-twin-pair comparisons. Drunkenness onset had a significant effect on sexual intercourse onset, such that twins who first experienced alcohol intoxication at a younger age than their co-twins were also more likely to have sex earlier than their co-twins. CONCLUSIONS: Relationships between substance use and sexual intercourse onsets may be due mostly to shared underlying factors; there was only a small relation between intoxication onset and sexual intercourse onset, and no direct relation between smoking and drinking onset and sexual intercourse onset.<p /> <p>Language: en</p>
LA  - en
SN  - 1054-139X
UR  - http://dx.doi.org/10.1016/j.jadohealth.2013.07.013
ID  - ref1
ER  -