...I don't want this to happen with someone I have a deep emotional connection with.
Along with the 8 years of aging, you might have answered your own question. You are not emotionally involved with the escorts, just trying to get some physical contact and sexual release Any future girlfriend would probably include emotional connection, that might tend to the matter of current concern.
It might also be a good time for you to make an appointment to see a medical professional. As we age, our bodies go through changes. A doctor can do you some tests which could rule out any physical issue. Blood pressure, circulation, diabetes mellitus and a few other things may be lurking which are causing sensitivity problems.
Best of luck.