|1.||nature's credit card|
trading sex for something.
from an episode of The Golden Girls:
Blanche and Dorothy are discussing Blanche's birthday gift to Rose: a detective to follow around Rose's boyfriend
Blanche: Well I can't take it back, I paid in advance
Dorothy: Can't you get a refund?
Blanche: Well no I paid with nature's credit card
Dorothy: You never leave home without it.