We didn't mean "sex" sex.

virginity pledgers invite more sexually transmitted disease risks than non pledgers

The study found that:

many pledgers who claimed to be virgins were having premarital sex. Although a large number of adolescents avoided vaginal intercourse, they were more likely to have oral and anal sex without the use of condoms.

The team found the male pledgers 4 times more likely to engage in anal sex and both male and female pledgers 6 times more likely to have oral sex.

The study steered by Dr. Hannah Bruckner was published in Journal of Adolescent Health.