Over the years, several upstanding members of society have stood erect in the firm opinion that sexual innuendo has tainted the virginal waters of comedy with its rapid, repeated penetration into mainstream humour. These opinions grew in popularity over time, starting off slow but getting progressively faster and faster, reaching a climax around '69. Since then, such opinions have slid in and out of popular acceptance. However, most modern-day comedians agree that a good, firm grasp of the subject is needed in order to tackle the fact that it's getting harder and harder to do sexual innuendo properly. Some even think that all previously used jokes should be rolled up and thrown away in order to avoid certain unwanted outcomes that might result from reuse.