title: Sexual mixing patterns of patients attending sexually transmitted diseases clinics.
abstract: BACKGROUND
  Theorectical studies have highlighted the importance of patterns of choice of sex partner in the transmission and persistence of sexually transmitted diseases (STDs).
  
  
  OBJECTIVE
  To describe reported patterns of sexual mixing according to numbers of sex partners in STD clinics.
  
  
  METHODS
  Patients attending public health clinics in Seattle, Washington were interviewed about their own and their partners' behaviors.
  
  
  RESULTS
  Throughout, patterns of sexual mixing were weakly assortative. Across activity groups, many respondents believed their partners had no other sexual contacts. Those with three or more partners frequently perceived their partners to have three or more partners as well.
  
  
  CONCLUSIONS
  Assortatively mixing persons of high sexual activity makes the persistence of STDs within a population likely (i.e., they act as a "core group"). Additionally, because mixing is not highly assortative (like with like), a steady trickle of infection from members of the core group will pass to other segments of the population.
authors.affiliation: Department of Zoology, Oxford University, United Kingdom.
authors.forename: G P
authors.initials: GP
authors.lastname: Garnett
authors.forename: J P
authors.initials: JP
authors.lastname: Hughes
authors.forename: R M
authors.initials: RM
authors.lastname: Anderson
authors.forename: B P
authors.initials: BP
authors.lastname: Stoner
authors.forename: S O
authors.initials: SO
authors.lastname: Aral
authors.forename: W L
authors.initials: WL
authors.lastname: Whittington
authors.forename: H H
authors.initials: HH
authors.lastname: Handsfield
authors.forename: K K
authors.initials: KK
authors.lastname: Holmes
mesh_terms: D000293:Adolescent; D000328:Adult; D000554:Ambulatory Care Facilities; D005260:Female; D006801:Humans; D008297:Male; D012725:Sexual Behavior / Q000706:statistics & numerical data*; D012747:Sexual Partners; D012749:Sexually Transmitted Diseases; D014861:Washington