@article{009c97533e6e4f318d5a9e014233fb6b,
title = "A twin study of sexual behavior in men",
abstract = "The role of genetic and environmental influences on age of initiation of first sexual relations and engaging in sexual activity with multiple partners (10 or more partners in 1 year) was investigated in male twins (N = 6, 744) from the Vietnam Era Twin Registry. Individual differences in both types of sexual behaviors were heritable, but only age of onset of sexual relations was significantly influenced by the environment shared by the twins. There was a moderate negative correlation between age of initiation of sexual relations and the multiple partners variable; initiating sexual relations earlier was associated with a higher probability of having multiple partners. The additive genetic influence on age of initiation also influenced the multiple partners variable. The substantial unique environmental influences on each variable were uncorrelated with each other. The data suggest that the observed association between age of initiation of sexual relations and having multiple partners is due to genetic influences common to both behaviors.",
keywords = "Genetics, Multiple sexual partners, Sexual behavior, Twins",
author = "Lyons, {Michael J.} and Koenen, {Karestan C.} and Francisco Buchting and Meyer, {Joanne M.} and Lindon Eaves and Rosemary Toomey and Eisen, {Seth A.} and Jack Goldberg and Faraone, {Stephen V.} and Ban, {Rachel J.} and Jerskey, {Beth A.} and Tsuang, {Ming T.}",
note = "Funding Information: This research was supported by a grant (DA04604) from the National Institute on Drug Abuse to Dr Ming T. Tsuang. The United States Department of Veterans Affairs has provided financial support for the development and maintenance of the Vietnam Era Twin (VET) Registry. Numerous organizations have provided invaluable assis- tance in the conduct of this study, including Department of Defense; National Personnel Records Center, National Archives and Records Administration; the Internal Revenue Service; National Opinion Research Center; National Research Council, National Academy of Sciences; and the Institute for Survey Research, Temple University. Most importantly, the authors gratefully acknowledge the continued cooperation and participation of the members of the VET Registry and their families. Without their contribution, this research would not have been possible.",
year = "2004",
month = apr,
doi = "10.1023/B:ASEB.0000014327.11433.66",
language = "English",
volume = "33",
pages = "129--136",
journal = "Archives of Sexual Behavior",
issn = "0004-0002",
number = "2",
}