Penis fillers were an unexpected talking point at the recent Winter Olympics after claims that male ski jumpers were having them to improve performance.

So this week we’re digging into the UK’s penis filler industry.

James visits a private clinic in Manchester to hear about about the procedure, which involves hyaluronic acid being injected to temporarily increase penis girth. 

He meets Jason, who had his first penis filler five months’ ago, and he explains why he wanted it and how he weighed up the risks versus the benefits.

James also chats to an NHS surgeon who says increasing numbers of men are seeking out the procedure - and he is dealing with the consequences when it goes wrong.

Also this week, why is aspirin in short supply?

Presenter: James Gallagher

The show was made by the BBC’s Audio Science Unit in collaboration with The Open University.