This is a rather wonderful bit of forgotten social history:

https://www.stuff.co.nz/entertainment/arts/96610377/moral-panic-and-milk-bar-cowboys-lower-hutt-has-seen-it-all

I think milk bars were sometimes seen the same way in the UK, my wife knew about them from Essex. (A bit before my time, or in the wrong places, when I was in NZ: I never encountered one that was a den of sex and motorcycling, but I guess if you lived in Lower Hutt, abusing dairy products and fucking would be all the entertainment there was).