To put a condom on properly, first unwrap it. Do not unroll it yet. Examine it to determine in which direction it unrolls. Grasp the reservoir end with your thumb and forefinger and place the rolled up condom on the head of the erect penis. If it has no reservoir end, grasp approximately a quarter inch of the tip of the condom between your thumb and forefinger, and place the unrolled condom on the head of the penis. Unroll the condom over the head of the penis, making sure there is no air in the condom. If there is, squeeze it out with your thumb and forefinger. When you are certain there is no more air in the condom, unroll it down the shaft of the penis until it will unroll no further. Condoms break for two main reasons: Air becomes trapped inside, causing the condom to burst, or lubricants are used improperly. If the vagina is not adequately lubricated during intercourse, friction can cause the condom to break. To avoid breakage, it is important for the vagina to be lubricated adequately and properly. Only use a lubricant designed for use with latex products. Never use petroleum jelly, mineral oil or any sort of hand or body lotion.