I think it's safe to conclude that sex will NOT be part of the date (strictly platonic), unless you are super good-looking and super charming. Most women will not put out on a first date, so a celebrity will be even less likely to do so. First, you'd have to be in her league (i.e. a celebrity or extremely wealthy person yourself). That only gets you to home plate; you have to be both super good-looking and say a bunch of super-special stuff to go around the bases.
Highly, highly doubtful. These dates are done for charity in good fun. You are paying to be seen in public with a celebrity. They are not fronts for celebrity prostitution.
As for other charity dates, there was an Ebay auction last Christmas for a date with left-leaning MSNBC commentator (talking head)
Flavia Colgan. A Harvard graduate, she is a Democratic strategist who has worked for some Pennsylvania politicians in addition to her frequent TV appearances. She is one of the few good-looking politicos for the left. Some links for the Flavia Colgan charity date:
http://www.pnionline.com/dnblog/flavia/archives/2006_01.html
http://www.philly.com/mld/dailynews/news/local/13370520.htm