Key points are not available for this paper at this time.
Douglas Nichols, Emile T. Woods, Deborah S. Gates, Joyce Sherman, Sexual Behavior, Contraceptive Practice, and Reproductive Health Among Liberian Adolescents, Studies in Family Planning, Vol. 18, No. 3 (May - Jun., 1987), pp. 169-176
Nichols et al. (Fri,) studied this question.