When looking up the Tom Baker quote (was it really that long ago?) I found this old Popbitch mailout from 2001.
https://groups.google.com/forum/#!topic/alt.music.miocene/vjmxCb_qu9w
The tale below is mentioned in a
gay blog which reveals who the two popstars are on this Popbitch blind (whether it's accurate, is another story):
One night on Hampstead Heath, a famous gay 80s pop star was performing oral sex on a man wearing a motorcycle crash helmet. Suddenly the penis in his mouth went limp. Looking up to find out the problem, the star was shocked to see, behind the helmet, another, equally-famous, short-haired gay pop star.
The blog also adds,
(The smalltown boy had become a victim of love...)
Which would be Jimmy Somerville and Andy Bell - for those who still don't know, JS was in The Communards, then went solo. Andy Bell was/is in Erasure. If you're still stumped, I'm obviously much older than you
Also from the Popbitch mailout from years ago - and mentioned on that blog - but the pop star's secret identity isn't revealed. My money's on the sadly-departed George Michael:
Which megastar singer surfs gay chat rooms for sexual partners, going under the nickname "Regents Park Bi"?