My first wife was also stricken with cancer (ovarian) and it was a very long and slow process. During that time (4 years) sex became virtually non-existant. I also had needs/desires that I wanted to take care of. Would I participate in this lifestyle to do so - no. Check your local newsparer, pay a few bucks, have a good time for an hour or so, leave and return to your real life. You will get the release you are looking for, will not screw up someone elses marriage and it is business. Will there still be guilt feelings, yes but at least they are only your own. You need to be there with your wife providing support and care. My wife passed away a few years ago, I met a wonderful lady who introduced me to the lifestyle and we are enjoying it "together". That's what it is all about - not merely cheap sex.
My thoughts