Erotic massage in Melbourne is usually a part of a brothel menu, as they don’t even need to pretend about happy endings or full service. Take a look at BodyLine (https://www.bodyline.net.au/) 10/13-21 Thomas St, which is actual a brothel that specializes in sensual massages. Interesting, isn’t it? For once it’s not a massage parlor that’s secretly a brothel, but the other way around, sort of.
And then there are those ran-down Asian joints that still play the game of appearances around the less frequented parts of town. South Melbourne Spa (https://www.southmelbournedayspa.com/) has an option without the sex part if you just want the massage. Number 100 (https://www.number100.com.au/) at 100 Johnston St has a back-alley entrance, in case being followed by a PI or your wife.