Here's a somewhat related question. I dated a gal for about three months, two months of which included fairly steady sex. During that time I was not a total cheapskate and spent a fair amount of money on theater and concert tickets, flowers, dinners, etc.
When the relationship ended abruptly, I went back and estimated all the money I'd spent compared to the number of times I'd gotten laid. The cost to me was about $52 per orgasm, which occurred no less than twice per session. (Oh, and I'm talking about mine, not hers. Situation reversed, she'd have made out like a bandit because she always had multiples.)
Can't provide pics, but she was a decent looking woman. Think of a curvy Scarlett Johansson (circa "She's Not That Into You") but 35 years old.
So, as far as paying for sex goes, did I get a good deal?