In the 70s, I frequented these in the East End: Bethnal Green, Poplar, East Ham.
Very mixed crowd.
I was all eyes for the black guys and boy was there an eyeful.
In one of these places, there was a muscular guy in his 30s, good looking, affable and hung, really hung - flaccid, I’d say 10 inches and big heavy balls - a gay erotic fantasy. He walked around in the buff. He also gave rub downs in the hottest of three steam rooms; I can only imagine how hands caressed that massive bollocks in the dense steam .
He often gave me a sidelong look - alas I never pushed myself forward😢
However, the sight of him was a thrill.
If you’re reading this, Big Boy, I salute you😎