We all seem to agree that whatever two consenting adults agree to do is OK - why it is a problem to you that some of us find some of those activities distasteful (to varying degrees) and do not want to partake ourselves is a mystery to me.
If you care to look through my posts, I've never said I agree with the OP's "role play", and nor do I have a difficulty appreciating that it's beyond the pale for most people.
What I am trying to ascertain, however, is where people think role play stops and becomes an indication of repressed behaviour (and that all role play is evidence of repressed desire), or whether role play always remains just that, however distasteful the subject matter.
For instance, earlier on, Daviemac stated "You are sick in the head to even think about it, pretending an escort is you daughter to me shows you must be harbouring secret fantasies about incest." Now, I don't know his background or whether he has kids, or how old he is, but I presume that he (and other punters) are familiar with e.g. Grand Theft Auto or other 1st person shooter games. Do people who play such games harbour secret fantasies about being a pimp, dealer or murderer, or is it regarded as just clean fun?
I'm actively looking on the web for research studies into the psychology of sexual role play, but as we all know, it's a bugger to sort the wheat from the chaff on the web.