A woman is suffering from a headache and decides to get an early night.
Her husband follows her to bed with other ideas. 'Pssst...........' the husband whispers as he snuggles up to his wife. 'Did you know it's been proven that having sex can cure headaches?' 'That may be so,' his wife replies. 'But so can paracetamol - and they last for up to four hours.'