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nlike clearly defined `real-world' net-, social networks tend to be

Summary: U
nlike clearly defined `real-world' net-
, social networks tend to be
subjective to some extent2,3
the perception of what constitutes a social
link may differ between individuals. One
unambiguous type of connection, however,
is sexual contact, and here we analyse the
sexual behaviour of a random sample of
to reveal the mathematical fea-
tures of a sexual-contact network. We find
that the cumulative distribution of the
number of different sexual partners in one
year decays as a scale-free power law that
has a similar exponent for males and
females. The scale-free nature of the web of
human sexual contacts indicates that strat-


Source: Amaral, Luis A.N. - Department of Chemical and Biological Engineering, Northwestern University
Stanley, H. Eugene - Department of Physics, Boston University


Collections: Biology and Medicine; Computer Technologies and Information Sciences; Materials Science; Physics