Philby was part of the Cambridge Five ring of British traitors. There were likely more than five in this ring.
Oxford and Cambridge were very fertile recruiting grounds for such traitors by the Soviet Union. Still is for Russia. Though now the incentive is money rather than ideology. A cursory look at Bill Clinton’s activities at Oxford as a Rhodes Scholar (which he did not complete) show a classic recruiting pattern for a Soviet mole.
The Soviet Union used our Ivy League schools in the same fashion. Russia still does.
As far as a homosexuality, there is a dark thread of that running through the British “upper classes”, their “public schools”, and the traitors recruited from such. It is a key intelligence community indicator of likely treasonous activity.
Always remember; traitors sell secrets, spies buy them. Such is the world of smoke, mirrors, and betrayal.
Nothing but contempt for the Ivy League.