Every New Year's Eve...
Every New Year's Eve, I challenge my husband. If he can last five minutes inside me without coming, he can have all the orgasms he wants for the next twelve months. Otherwise, he has to wait until next New Year's Eve to be allowed to come.
With such a reward, can he resist climax for five minutes? When he's been completely chaste for a year? When he's quivering with aroused frustration? When I can make him hard with little more than a whisper?
He never stands a chance.