In the book, The Wanderers, two of the main characters were involved in such a relationship, something only somewhat hinted at in the movie when they wake up in one of their rooms dressed in their undies, then seen on a sign for San Francisco as they escape from the Bronx. Being that it was 1963, maybe some figured they were off to Haight-Asbury and it ain't the first time someone slept in their underwear, but I dont see anyone threatening to sue them for not getting it what went on before bedtime.
I didn't even read that book, a sibling told me how that relation was more detailed in it. On top of that, while The Wanderers gang was a composite of real gangs, the Fordham Baldies were a real, only they weren't bald as portrayed, just that the bald eagle was part of their emblem.
As seen in the screenshot, the book describes the Ducky Boys as "stunted Irish madmen...." none over 5'6", and they were a real gang too, I found out last year. But they weren't all short like that nor totally Irish and actually DID speak, unlike the book saying it was limited or in the movie where they were totally silent. (Ace Frehley was a Ducky Boy, btw).
Anyways, the point of all this is from reality > book > movie > viewing audience eyes things change, and as seen on the screen with the Wanderers, that adds to the magic of the movie, and even the real life Ducky Boys & Girls shrug off the exaggerations with a laugh.
Dang, among the things I went off to look for was an article with that last bit, but then I found them pages and was looking for pics and it is getting late,,,