Man on a train says to a pretty girl "Excuse me miss ~ if I gave you £1000 would you kiss me?"
Pretty Girl replies "Yes, yes I would"
Man says "If I give you £1 would you let me fvck you?"
PG (outraged) "What kind of a girl do you take me for?"
Man "We have already established that my dear ~ now we are negotiating the price"
*Not original, variously ascribed to Oscar Wilde, Winston Churchill, GBS and others.