What's driving men to get penis fillers, despite the risks?

Jason didn't want a "Coke can" – that's the nickname for a penis that has been enlarged with so much filler it resembles a stubby drink can.

"Some people go really overboard," Jason tells me when we meet in Manchester.

His procedure increased the girth of his penis by 16% - an amount he, and his partner, are really happy with. He says it has given him a "self-confidence boost".

"Everything still functions" as normal, Jason explains - just with "that extra little bit of width".

It is not clear how many men like Jason are having penis fillers. And you can't walk down the street and get a sense of it in the way you can visibly see the popularity of lip fillers. There is little regulation and there are no official records as anybody can start offering the procedure.

Penis fillers even became the topic of a bizarre conspiracy theory at the last Winter Olympics. Male ski jumpers were rumoured to be using fillers to increase the surface area of their suits so they could jump further.

However, some men have ended up in A&E with a penis turning black and skin "sloughing off" after a botched procedure. And the British Association of Urological Surgeons has issued warnings to men having these procedures.

James Gallagher visits a private clinic to find out about about the procedure, meets a man who has had it done, and chats to a surgeon who says he is dealing with the consequences when it goes wrong.