Where did strangers answer the "call of nature" in Victorian London? At the start of Victoria's reign, options were limited. Some pubs had primitive outdoor "urinals" -- no more than a vertical slab of stone -- but men largely resorted to the nearest alley.
Americans eat pizza the way it was intended, by picking up a slice with their hands. In other countries they daintily eat pizza the wrong way, (I grew up in New York so yes, I can be harshly judgmental about this,) with a knife and fork.
While the general relevance of gay culture for gay people tends to recede as homophobia rapidly falls off and integration speeds up, it shouldn't be a surprise that the world of anonymous sex persists and in fact flourishes. Like camp, it's the slutty sensibility of a culture of (too much) choice.