Zack is Barrys running buddy, and hes not nearly as straight as Barry. Years ago, Zack was a male escort, when those things were hot in Atlanta, but he seems to have lost his way.
Straight, handsome and wonderfully built, John is a total gentleman. He wanted to be a male escort, because he loves beautiful women. Then he found out that beautiful women dont need to pay for it. So, he switched to escorting wealthy men.