Girls only-should I sleep with an escort?

No. Women respect men who are not, as you say, "pigs." Morality and caring about a girl beyond her use to you as a object will get you much farther than any good looks. I would have a very difficult time respecting a man who would sleep with an escort, and I would certainly never allow myself to be in a relationship with him. Don't do it. There's really no benefit in it in the long run.