Abstract: Barriers for preventing contraception and disease transmission comprise, in the simplest embodiment, a tubular or cylindrical shield (12, 38) of rubber to isolate the penis from the vagina and an attached flange portion (14) to shield the area surrounding the penis and vagina. The underside of the flange has adhesive (16) around the edge border to retain the flange in place. The device may be used by a female partner and is more effective than a condom since it shields the surrounding area. The device may be formed as part of a panty (30) or man's brief (70) so that the female can control prophylaxis and contraception, or the subordinate male in gay sex can control prophylaxis. The tubular rubber shield is provided in a compacted, folded state (38) with a lubricant (54, 56) and a lubricant-impervious covering (20, 22, 58, 66). When made part of an undergarment, the inner side of the shield is covered with a layer of cotton (62) for comfort.