The girl of my dreams wouldn't charge me for sex
Good answer - you have much smarter dreams than me!
I would not pay much just for a really cute girl I see on the street. It would have to be a celeb I'd lusted after or a major porn star.
I'd pay utterly silly money to fuck Natalie Portman (before anyone says why, watch Closer). Or Chloe Moretz (next Feb once she's legal obviously!). I'd remortgage my house to fuck them. Heck I'd SELL my house no question - but only for a seriously hardcore fuck for like 3 hours. With filming. Well they are actresses so they can't complain about a camera!
OK that's the completely unrealistic version - if one of my all time favourite porn stars came online escorting even at extortionate rates I'd still stretch a long way - take Klara (my Avatar), or Sophie Dee, or Velicity Von, or Lucy Li - I'd happily blow say my whole quarterly bonus of £3k - but again only for a 3 hour hardcore no-holes-barred session not just an hour vanilla. Actually, I would probably stretch as far as £10k - always can remortgage or just get a new credit card with a £10k limit and then pay it off over the next 5 years or something. Gotta get your priorities straight, life is short and I'd rather die having fucked an idol and leave my debts to my estate than think "what if...".