A university lecturer was giving instructions for tomorrow's final exam. "I won't tolerate any excuses for you not being here tomorrow," she said. "I might consider a death in the family or a nuclear attack, but nothing short of those." A student in the back row raised his hand "What would you say if tomorrow I said I was suffering from such complete and utter sexual exhaustion that I couldn't lift the pen?" The lecturer waited for the titters to die down and then replied, "I'd say you'll have to write with the other hand."