With regards to prossies existing... I guess the bottom line is, if both parties get something out of it, then who gives a shit? :S
With regards to somebody in a happy relationship shagging em.. then they're out of order imo
With regards to folk not getting any and shagging em... well I guess that's down to them to decide for themselves if that's what they wanna do
Doing it for sex i can totally understand, if you can't get it anywhere else then go for it, like Jiggs said, both parties get something out of it. It's the idea of someone doing it to avoid having to spend time (and money apparantly!!:| ) with real women doing real things and having real conversations!!! How socially inept must a man be if they would rather pay a woman for a quick shag instead, way beyond me that one