The incident is alleged to have happened at St George's Hospital.
A man and woman are facing trial for outraging public decency in hospital in "full public view".
Fiona Louise Carey, 39, of Bridgestoke Road, Thornton Heath, is alleged to have performed oral sex on Kamil Abramowicz, 31, of Leopold Road, Wimbledon.
It is alleged the pair were caught out performing the sex act in full public view at St George's Hospital, in Blackshaw Road, Tooting, on April 9.
The charges were read out in Lavender Hill Magistrates Court, in Lavender Hill, today (Thursday, May 9).
The couple did not enter a plea.
Mrs Carey and Mr Abramowicz, who were handed unconditional bail, will next appear at Wimbledon Magistrates' Court on July 10.
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