Since 1993, in response to a movement sponsored by the Southern Baptist Chu
rch, over 2.5 million adolescents have taken public "virginity" pledges, in
which they promise to abstain from sex until marriage. This paper explores
the effect of those pledges on the transition to first intercourse. Adoles
cents who pledge are much less likely to have intercourse than adolescents
who do not pledge. The delay effect is substantial. On the other hand, the
pledge does not work for adolescents at ail ages. Second, pledging delays i
ntercourse only in contexts where there are some, but not too many, pledger
s. The pledge works because it is embedded in an identity movement. Consequ
ently, the pledge identity is meaningful only in contexts where it is at le
ast partially nonnormative. Consequences of pledging are explored for those
who break their promise. Promise breakers are less likely than others to u
se contraception at first intercourse.