well if you have a bad back, going to one of those places will make it even worse, if you meet the right lady (wink wink).
Dr Ploy suggests you get a deepthroat blowjob, til completion, this will make you put on your war face (think of the scene in Full Metal Jacket.... "Thats not your war face, let me see your war face") and should cure the problem you have with your back.. dont part with anymore than 20 quid for it either.. tell them Dr Ploy said its covered by the Medical Card Scheme..