Fildena 100 How do you know if you need a Fildena 100? Impotence is one of a man's greatest fears. Failure to have s*x can make you feel less masculine, make you feel less attractive to the opposite s*x, and even cause concern that your husband will leave you for a more masculine instance. These feelings arise from our basic instinct for procreation; it is the instinct that separates all living things, and it is what protects the species from extinction.