Вот, в своё время насобирала статистику  (англоязычные сайты)http://www.americanpregnancy.org/preventingpregnancy/birthcontrolfailure.html Condom - Male - 14%Withdrawal - 19% http://www.stanford.edu/group/SHPRC/ch6_non.htmlhttp://www.stanford.edu/group/SHPRC/ch6_bar.htmlWithdrawal Effectiveness (failure rate)- 7%-22%. Condom Effectiveness (failure rate): 3%-14%. http://www.youngwomenshealth.org/summarychart.htmlWithdrawal: Typical Use: 19 Women Become PregnantPerfect Use: 4 Women Become PregnantCondoms: Typical Use: 14 Women Become PregnantPerfect Use: 3 Women Become Pregnant http://www.cfsh.ca/Your_Sexual_Health/Contraception-and-Safer-Sex/Contraception-and-Birth-Control/condom.aspxThey are 86-97% effective.