| A sexual network is a social network that is defined by the
sexual relationships between a set of individuals.
Like other forms of social network, sexual networks can be formally studied using the mathematics of graph theory. Recent epidemiological studies have investigated sexual networks, and discovered that the statistical properties of
sexual networks are crucial to the spread of sexually-transmitted diseases (STDs). Subgraphs, both large and small, can be defined within
the overall sexual network graph; for example, people who frequent particular bars or clubs, belong to a particular ethnic group
or take part in a particular type of sexual activity, or are part of a particular outbreak of an STD. In particular, assortative mixing between
people with large numbers of sexual partners seems to be an important factor in the spread of STDs.
In a suprising result, mathematical models predict that the sexual network graph for the entire human race appears to have a
single giant component that
indirectly links almost all people who have had more than one sexual partner, and a great many of those who have had only one
sexual partner (if their one sexual partner was themselves part of the giant component). Most people who are not part of the
giant component are either virgins, or couples who have never had sex with anyone except each other.
For serious epidemiological work, the time sequence of sexual contacts is important.
References
- Kretzschmar, Mirjam. "Sexual network structure and sexually transmitted disease prevention: a modeling perspective".
Sexually Transmitted Diseases volume 27, number 10 (November 2000): pages 627–35.
- How Sexually connected are the Swedes? (http://www.sociology.su.se/seminarier/tisdagssem/bilaga_liljeros2.pdf) (Adobe .pdf
format)
- P. De et al. Sexual network analysis of a gonorrhoea outbreak (http://sextrans.bmjjournals.com/cgi/content/abstract/80/4/280) Sex Transm Infect
2004;80:280-285
- Bearman PS, Moody J, Stovel K. "Chains of affection: The structure of adolescent romantic and sexual networks," American
Journal of Sociology, Vol. 100, No. 1.
External links
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