Better question, would you offer money for sexual favors? In fact, I think I'll make that poll...
For now, my answer to this, is depending on the circumstances... Say I lose my job, house, car and all of that, and my girlfriend and I are thrown out on the streets. If someone were to offer to pay a large amount of money for sexual favors, to either my girlfriend or I (And he didn't care which one of the two.). I would never put my girlfriend through that, so yes, if it were a large amount of money, and we desperately needed it, I would. On a related note, if someone offered my girlfriend money for sexual favors, I'd probably skin him and feed him his testicles...