Despite traveling the country a lot for work I have a damned mobile phone that has to be answered and it means I frequently have to change plans. Thus I rarely have time to commit to a pre booking that I could very likely end up canceling. That in turn means I have a huge list of candidates I half plan, but never visit. The drop in rub and tug can scratch an itch, you have no need to plan, just rock up and get on with it, but its not a good solution. Ive seen too many ladies retire or go off the boil before Ive had chance to try and see them. If you have a hankering and can plan her in, then do so.