Bingowings said:

That was the briefly true in the UK (seventies and eighties) but not everywhere like Polari, hanky codes and cottaging.

Homosexuals living in secret and using secret codes to communicate to each other has largely been made redundant and only the sphere of the very insecure or isolated.

Indeed. I think it was during the Victorian era that Homosexuals would wear a green carnation so that one another would secretly know their orientation... or maybe that was just a thing followers of Oscar Wilde's would wear.