Differences in the number of partners, which could be an ascribed social position, are usually associated with differences in life style. People who drink and smoke more than others have had a large number of sex partners. People who often drink until they are drunk have had several partners during the last year more frequently than others. Women who often drink until intoxication had as many sex partners as corresponding men. The differences in numbers of sex partners are therefore partly explained by the fact that men more often choose a life style involving much alcohol and numerous sex partners.
Smokers have had several sex partners more frequently than have those who stopped or non smokers. Of smokers, 56% of men and 31% of women had had at least ten partners during lifetime. Corresponding figures for nonsmokers were 31% and 7%. Smokers had had several partners during the last year more frequently than other groups.