If you literally just want to fuck a hole then why pay 70? Just go to Soho and drop 20 for a quick shot.
Or if you want a little longer then you will find ladies who do it for 50 or 60 for the hr.
Given your quandary, suggest you find the cheapest punts you can and form your own opinion from personal empirical evidence.
No need to tell us your conclusion but do feel free to review any of the ladies you cum across.