Should i sleep with ex lover for two&half grand?

im unattached,he's in a less (so he says) marriage.Is nearly 60&very wealthy,im not!We had an affair a few years ago,he was very generous to me,but i stopped it.I could really do with the money and he knows it,but I feel I'm worth more and want an amount thats really gonna make a change to my cirstances,but i cant tell him that.How much would you do it for?or would you not!