Keep the condom on the penis until after intercourse or ejaculation. Unroll the condom a short distance to make sure the condom is being unrolled in the right direction. The rolled ring should be on the outside. Then hold the tip of the condom and unroll it down to the base of the erect penis. Discard and begin with a new condom.
Adequate lubrication is important.
For polyurethane condoms, any type of lubricant can be used. If the condom breaks or falls off during intercourse but before ejaculation, stop and put on a new condom. Soon after ejaculation, withdraw the penis while it is still erect. Hold the condom firmly against the base of the penis to prevent slippage and leakage of semen. Check the condom for visible damage such as holes, then wrap it in tissue and discard.