Hi Shirley,
I answered your other question which is similar to this question. He has medical problems. Is it really that bad he can't use Viagra or Cialis? What about the use of sex toys and other ways to please you sexually? Have you suggested that to him?
Since he has medical problems, I think as a wife you should be considerate, supportive and compassionate. This is the time that he needs you to be understanding. You have been married to him through thick and thin, and with the marriage vows IN SICKNESS AND IN HEALTH TILL DEATH DO YOU PART, do you think it's just right to fulfill these vows you made before God?
How about if you were the one with medical problems and could not provide him with sizzling sex, would you be happy if your husband would see another woman for sex? How would that make you feel?
Being a good looking lady is one thing but a wife who knows how to stand by his man is a more admirable trait and virtue.
Take care and please do the right thing.