Severe and impulsive promiscuity, along with a compulsive urge to engage in illicit sex with attached individuals is a common symptom of borderline personality disorder, histrionic personality disorder and antisocial personality disorder but most promiscuous individuals do not have these disorders. The study measured one-night stands, attitudes to casual sex, and number of sexual partners.
Britain's position on the international index "may be linked to increasing social acceptance of promiscuity among women as well as men".
The term can carry a moral judgment if the social ideal for sexual activity is monogamous relationships.
A common example of behavior viewed as promiscuous by many cultures is the one-night stand, and its frequency is used by researchers as a marker for promiscuity.
American experiments in 19 found the great majority of men were willing to have sex with women they did not know, of average attractiveness, who propositioned them.
Many species form stable pair bonds, but still mate with other individuals outside the pair.
In biology, incidents of promiscuity in species that form pair bonds are usually called extra-pair copulations.
A 2006 systematic review (analyzing data from 59 countries worldwide) found no association between regional sexual behavior tendencies, such as number of sexual partners, and sexual-health status.
Much more predictive of sexual-health status are socioeconomic factors like poverty and mobility. university study of international promiscuity found that Finns have had the largest number of sex partners in the industrialized world, and British people have the largest number among big western industrial nations.