Max Clifford has been told he must serve at least half the eight-year sentence handed down at Southwark Crown Court in prison.
Judge Anthony Leonard told Clifford he had shown a "contemptuous attitude" and "quite extraordinary behaviour" while showing "no remorse" for his crimes.
The judge said: "These offences may have taken place a long time ago, when inappropriate and trivial sexual behaviour was more likely to be tolerated, but your offending was not trivial, but of a very serious nature."
More top news
Younger workers are missing out on pay rises, with people born in the 1980s earning £40 a week less than those 10 years older, studies show.
Four in 10 European doctors are considering leaving the UK following Britain's vote to leave the EU, research suggests.
Eating 10 portions of fruit and veg every day could could significantly reduce the risk of heart disease and cancer, researchers say.