A University professor is giving a talk in the local village hall and he has the opportunity to test his theory that making love with greater regularity has a proportionately positive effect on people. So he asks who in his audience indulges in intercourse every night. 5% of the assembled raise their hands, grinning from ear-to-ear. He then asks who makes love once a week. The majority of people raise their hands, smiling contentedly. Next up he asks who has sex once a month. A few people raise their hands and look reasonably content. Just to comprehensively prove his point he asks “Is there anyone here who has sex once a year?” At the back of the hall a tall man jumps to his feet, laughing out loud and waving his hand exaggeratedly in the air – “Me! Over here! I do!” The professor is perplexed at seeing his theory evidently disproved. Reluctantly, he asks the lone individual to explain. “It’s tonight!” he shouts back.