Yes there is software that can un-blur a face, but it also depends on what you have done to the photos before you blur them lol. I won't elaborate, but you can distort them to the point of not being recognized should someone use this software. I won't elaborate in public, but photoshop is your friend in these cases.
I won't do the side shot because as "true-whatever" stated, it won't do much good in being discreet. I provide where I live, work, and go to school and it's not hard to figure out who I am. I don't mind if a guy sees my face after screening, but I won't send him those pics via email. I will likely send him to a site not associated with any escort services and let him view me there...just ask DED.
That way if he decides to copy the pic and say, "Look ya'll this is London," there is no proof that the girl in the pic is an escort.
I don't know about anyone else, but a dime is not worth ruining my future in the long run. I know I am losing business over it but I don't much care. Many men that I see have told me they would never take an escort in public who shows her face for fear of being outed with her. Most of my dates are multi-hour and half of that is in public. It only takes one time.