There's only one way I know. Sexual abstinence only programmes to prevent HIV infection in high income countries:
18 Year Old Virgin
Pledgers and matched nonpledgers were compared 5 years after the pledge on self-reported sexual behaviors and positive test results for Chlamydia trachomatis , Neisseria gonorrhoeae , and Trichomonas vaginalis , and safe sex outside of marriage by use of birth control and condoms in the past year and at last sex. Items averaged and scaled 0 to 1, not analyzed separately. Jonah Hill as eBay Customer. Jordan Masterson as Mark. I commended myself for making a healthy, albeit hasty, partner choice. Data show the means for pledgers versus nonpledgers, compared with t test, before and after matching.