I can't make out if you are a newbie or experienced punter. If newbie what on earth are you doing paying 50 extra for anal. If experienced, then I would look for another girl who includes anal in the price.
Sorry if I didn't make my position clear. No. I'm not going to pay £50 extra for anal.
What I find ridiculous about her profile, is the extra charge and the size condition. Anyone with any experience is going to look at this, and know that anal with her is not a realistic proposition.