Cooper Koch is revealing all about his, uh, revealing full-frontal nude scene in Monsters: The Lyle and Erik Menéndez Story.

The actor, who plays real-life convicted murderer Erik Menéndez in the Netflix drama co-created by Ryan Murphy, told Andy Cohen on Monday night's episode of Watch What Happens Live that he didn't use a prosthetic penis to film a scene where his character appears naked while showering in prison.

Koch made the announcement during Cohen's countdown of the most iconic full-frontal nude scenes in entertainment history, which also included mentions of Jude Law in The Talented Mr. Ripley, Kate Winslet in Titanic, Daniel Radcliffe in the play Equus, and Sharon Stone in Basic Instinct. While Cohen discussed Mark Wahlberg's "prosthetic dick" in Boogie Nights, Koch jumped in with a clarification of his own.

Netflix

"Also, just to say, mine was not a prosthetic," Koch said with a smile, later jumping in to express a playful "sorry" for interrupting Cohen with the revelation.

Cohen responded, asking, "You're very blessed, aren't you?" to which Koch grinned and said, "Well-hung!"

Koch's nude scene occurs on episode 3 of the series, which was inspired by the true story of brothers Lyle and Erik Menéndez, who were sentenced to prison in 1996 for the brutal murder of their parents, José (Javier Bardem) and Kitty Menéndez (Chloë Sevigny).

Shortly after the brothers' initial arrest, the show's version of events depicts Erik as particularly resistant to prison life, though he forms a peculiar bond with a fellow prisoner, and the pair share an intimate (albeit non-physical) scene in a shower.

Erik slammed the series in a Sept. 19 statement shared by his wife Tammi on X. "I believed we had moved beyond the lies and ruinous character portrayals of Lyle, creating a caricature of Lyle rooted in horrible and blatant lies rampant in the show. I can only believe they were done so on purpose," he said, in part.

Murphy has since defended his work, which suggests that the brothers had an incestuous relationship and were abused by their parents.

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"I’ll tell you my thoughts about the Menéndez brothers," he told The Hollywood Reporter in an interview. "The Menéndez brothers should be sending me flowers. They haven’t had so much attention in 30 years. And it’s gotten the attention of not only this country, but all over the world. There’s sort of an outpouring of interest in their lives and in the case. I know for a fact that many people have offered to help them because of the interest of my show and what we did."

Watch Koch talk about his Monsters nude scene in the clip above.