Replace them every once in a while. Friction from opening and closing your wallet, and from walking (if you carry your wallet in your pocket) can lead to tiny holes in the condom. Nevertheless, it is better to use a condom that has been in your wallet for a long time than to not use one at all.
Reemplácelos periódicamente, ya que la fricción que se produce al abrirla y cerrarla y al caminar (si la billetera se lleva en el bolsillo) puede hacer que se formen pequeños orificios en el condón.