no its like this.
A guy asks a girl “would you have sex with me for $10 million dollars?” and the woman says “sure”
Then he says “would you have sex with me for $20” and she says “never- what do you think I am, a whore?”
And the guys says “well we’ve already established that, now we’re just negotiating a price”
You are right, it was such an old joke I got it wrong—likely early on-set of Alzheimers.