Young good looking foreign girsl, who are reasonably active in the room, go to Blair st, older attractive scottish girls who know how to do the job, go to new town. London st has foreign girls who are nice looking, but as a general rule cant be arsed doing anything in the room. Oddly enough if you draw a line connecting all three they make a triangle, hence a kind of erotic leyline. Sometimes i am walking up south bridge to blairs st, when a mysterious force grips me , and i turn round and go to the new town, or london st. I reckon other punters experience this, its kind of like doctor who, for perverts. If you include scorpio, a haven for recidivists who have been moved on from elsewhere, you have a quadrilateral.