This is a good thread, for myself, I do not feel the guilt, i did in the begining, I have a loving wife and young children. I Love my wife very much and we have good sex. But, I have always had a above average sex drive, and when I was in my 20's growing up, I've had many partners. So for me I crave the passion and adventure, and the stimulation that I get from mutilple partners. Now being married with kids, I have never had a relationship with another woman. I hobby because it allows me to have the best of both worlds, I don't lie to the sp and tell them I love them and want to run away with them, nor do I love or treat my wife any different, I treat both with respect, and I would never fantasize that I'm going to fall in Love with an SP (hard to do somtimes!)
I often think to myself that "wow! I'm so lucky to be able to spend so little money and get to be in the company of some beautiful ladies, from any ethic back ground I choose! that is just so amazing! And I have come to realize that the ladies are like you and I, human beings with feelings, good days bad day etc, and respect them for what they do, you will find that you should not feel dirty or shameful. Enjoy it while you can, know where your heart is.
And as for the money part, all hobbies are expensive, that's the way it is!