Inspired by the use of fillers in people's faces, Dr Oates developed a technique that increases the girth of the penis by up to one inch.
The dermal fillers last for about two years and can be topped up or dissolved.
"We wanted it to be safe. Various permanent fillers are used in Mexico and Korea and some guys are fine, but we can also see these terrible results as well with lots of lumps and bumps and when it's permanent there's not much you can do," Dr Oates said.
"We're not creating these monster penises, they're not turning into donkeys or anything," he joked.
"We've had some guys who have a slightly smaller penis but the vast majority are entirely average standard. A few are already big guys who just want to be bigger."
"No such thing as too much of a good thing in this area," he told Daily Mail Australia.