 However, for girls, a past pregnancy had little correlation with secondary abstinence.Fear of pregnancy, wanting to wait until marriage, and not wanting to have sex were cited more often by virgins in the 12th grade than they were by 9th graders.Of the sexually experienced who are now practicing abstinence, girls were more likely than boys to say a lack of desire, fear of STDs, being afraid of getting caught, the belief that sex was not appropriate for someone their age, and that their parents had taught them the advantages of waiting as reasons why they made their decision.