Maybe it's a new idea and maybe it's not but I was thinking about a new type of "dating" website.
Y posts profile and sets a "get to know me" price.
X view profiles and pick a Y they like.
X pays "get to know me" price ($200 or whatever rate the Y wants)
X offers to meet the Y
They meet
X posts feedback on Y.
Site sends Y the money.
Disputes would be handled by the site. Things like "Y isn't the person in the profile" or "X didn't show up" would be investigated and monies returned or portions of monies divided between X and Y depending on the situation.
Next person(A) shows up to the profile. Sees that X had a great time so can assume that Y is an easy lay so A decides she is someone they would like to get to know.
Would this cover all of the legal concerns that hobbyist have? At this point it really is judging someone based on their profile just like any dating site. Sites like adult friend finder have a comments section and others will charge per message so it seems completely covered.
ps When I first typed this x = male and y = female but then I thought "Hey maybe women want to pay for dick so why filter them out"
pss: If anyone knows any of the aforementioned women, especially if they like fat guys that are a horrible lay, send them my way.