Here's what you do. Wait until he's passed out (when you are at a party, or something. Drugging him also works), then hide a coin in his anus. Later, ask him to let you borrow said coin of that type. When he says that he doesn't have a coin, pull the coin out of his anus. He'll think that you're a wizard, and whenever he doesn't want to have sex with you, you can threaten to turn him into a frog.

Do you folks know any good tricks?

How do you get permission to pull said coin from his anus though?

You can ask him to check for himself.

Does this work on women?