Assertion: virginity pledge | /r/HasProperty | effective at delaying vaginal intercourse
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text: Some studies have found that virginity pledges may be effective at delaying vaginal intercourse, but that they are ineffective in reducing the incidence of sexually transmitted infections (STIs) because pledgers may replace vaginal intercourse with other sexual activities, such as oral sex and anal sex; other research, however, has suggested no such substitution among pledgers, though pledgers may partake in vaginal or oral sex.