Dave Lee Travis arriving at Southwark Crown Court
Former BBC Radio 1 DJ Dave Lee Travis was an "opportunist" sex offender who targeted "vulnerable" young women, a London court has been told.
One young woman, aged 19, had been "assaulted live on Top of the Pops" in 1978, prosecutor Miranda Moore QC said.
The jury was shown footage of the alleged assault as the DJ introduced a song by The Smurfs.
Mr Travis, 68, whose real name is David Griffin, denies 13 counts of indecent assault and one of sexual assault.
Ms Moore told Southwark Crown Court the alleged offences had taken place in work settings, including at pantomimes, openings and prize-givings.
"The offences vary in gravity," she said. "All are sexual in nature involving unwanted contact by this defendant on much younger women, both over clothing and under clothing."
The youngest alleged victim, who was 15, claims she was attending a Showaddywaddy concert in 1978 at a farm in Gloucestershire, where the defendant invited her in to his trailer for a drink.
After discussing music, Mr Travis then commented on the girl's breasts, before lifting her top over her head and pulling down her bra to expose her breasts, Ms Moore told the court.
The woman claims she was then pinned to her seat. "In her words, she thought he was going to rape her," Ms Moore said.
A woman who alleges an assault in a BBC radio studio, when she was an 18-year-old virgin, went to the Daily Mail in 2012 after she felt nothing was being done by the BBC.
The court was told that Mr Travis denies the assaults ever happened, and claims the alleged victims are motivated by greed for compensation and media attention.
Mr Travis, who hosted the Radio 1 Breakfast show from 1978 to 1980 and was a regular host of Top of the Pops in the 1970s and 80s, is accused of carrying out the offences between 1976 and 2008.
Mr Travis, of Mentmore, Buckinghamshire, stood in the dock as the charges, which relate to 11 female complainants, aged between 15 and 29 at the time, were read to the jury.
Judge Anthony Leonard told the jury to try the case only on evidence heard during the trial.
He warned the jury of four men and eight women that there should be "no sleuthing" on the internet and said they could be jailed for contempt of court if they broke the rules.
The trial is set to last up to six weeks.