An attractive young med student was having coffee with her girlfriend and complaining about her fiancé's extraordinary sexual appetites.
"I barely have the strength to come to work in the morning," she murmured. "And now that he's on his vacation, things will probably be even more intense when he gets back."
"How long is he off?" the friend inquired. " It varies," she replied. "But usually it's just long enough to smoke a cigarette."