I’m sorry, but this is no good. The well being of your eternal soul is more important than your body and it’s urges. Sex is not a spasm. We are not animals. Self control is possible. It may be hard, but unite your suffering to the cross. If the person has AIDS, condoms are not reliable to prevent it, it can still go through. Many people get pregnant using condoms because many are defective (usually one in every box) and the HIV virus is smaller than a sperm cell so it goes through even easier. If the person has some other STD, there are many medications to supress the symptoms if you are willing to share in the suffering of your spouse (this may be a true sign of love). Evil is NEVER a means to a good. EVER. If someone is willing to reject God for sex because temptation is too strong that is their business. I hope and pray they go to confession with a truly sorry heart afterwards.