Barrier Methods: 2: A latex rubber or synthetic sheath that is placed over "erect penis before coitus to trap sperm They have an ideal failure rate of 2% and a typical failure rate of about 15%, because breakage or spillage occurs in up to 15% of uses. Advantage(s): One of the few "male responsibility" birth control measures available, no prescription Disadvantage(s): if latex, cannot be used if there is sensitivity or allergy to latex