Oh wow you haven't noticed me mention that until now?
You know it's not nearly as freaky as one might think. There is no sex at all, and not neccesarily even any nudity at all on the Dom's part. I was going to school with a very meek straight looking girl who was doing it and told me what it was like. It was very easy and could pay extremely well. Often the guys that like it are very successful men with a LOT of money to spend. If you give what they want, they'll come back religiously, and there's your rocksolid, predictable income stream.