Cooper Koch has denied any speculation that his viral nude scene in Monsters made use of a prosthetic.

The 28-year-old starred opposite Nicholas Alexander Chavez in the second season of Ryan Murphy's anthology series, which tells the story of the Menendez brothers, who were imprisoned for the 1989 double murder of their parents.

In episode three, Koch's character Erik is seen showering in prison - a scene that has garnered much attention due to the impressive size of Erik's penis.

Appearing on Watch What Happens Live, Koch spoke to host Andy Cohen about the scene during a segment ranking film's five most iconic full-frontal moments of all time.

"Just to say mine was not a prosthetic," Koch noted, prompting Cohen to reply: "Well that was going to be my next question. Congratulations to you, Cooper. You're very blessed, aren't you."

With a smile, Koch added: "Well.... hung."

Monsters: The Lyle and Erik Menendez Story is available to stream now on Netflix, while a third season starring Charlie Hunnam as serial killer Ed Gein is currently in development.