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Page 35. " they'd had sex 'in the street' - even 'on Oxford Street', he'd once heard. In six months' time perhaps he would know, he'd have sorted out the facts from the figures of speech. "

It's not clear whether 'Oxford Street', as used here, is gay slang or Polari. It does not appear in the on-line dictionaries and glossaries to be found on the Internet.

Polari Dictionary

Gay Slang Dictionary

Oxford Street is a major shopping street in London's West End. It extends from Marble Arch in the west to High Holborn in the east and is home to various department stores and retail chains (including Selfridges, Debenhams, John Lewis, Marks & Spencer), as well as numerous smaller shops.