Dr Mahesh Patwardhan allegedly rubbed himself against women and grabbed them from behind while bending them over an examination couch, Woolwich Crown Court was told.
He is accused of telling one woman to strip so he could see her tattooed behind and another that she would have "lots of sexy sex and orgasms" after he quizzed her about her sex life,the 'Evening Standard' reported.
The women treated by Patwardhan at his National Health Service (NHS) clinic at Queen Elizabeth Hospital in south London, and his private practices at the Blackheath Hospital and the Holly in Buckhurst Hill, Essex, came forward to complain about his methods and he was reported to the UK's General Medical Council (GMC).
Prosecutor Kate Bex said one of the alleged victims claims Patwardhan groped her between her legs during an appointment.
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"It lasted 10 seconds, but she was so shocked and surprised she did not say anything at the time," said Bex, who told the jury the woman eventually came forward after reading that Patwardhan had already been reported to the GMC.
A 37-year-old mother-of-two claims Patwardhan started giving her a hug at the end of appointments, pushing his body into hers and grabbing her bottom.
The gynaecologist denies all charges of sexual assault, and also denies two counts of fraud over claims he falsely billed private medical insurers for work he did not perform.
Patwardhan, whose hobby is singing, is a founder-member and singer of an all-doctor group called "Medico Melodies", which does events for charities. He has also performed in a number of stage shows across the UK.
The trial at Woolwich Crown Court is ongoing and expected to be concluded by next week.