Before you "swinger " becomes modern we called us "swinger" because we played swing music. This was long before your time - maybe in old books and old movies you can find something about that.
So you can guess what I mentioned
Haha, yes, I derived the intent of your original post! The swinging sixties and all the craziness that came with it.
But I got to quote Dylan over here:
The times, they are a-changin'!