Certainly! Here's a list of 15 male actors who went full-frontal in movies without using prosthetic penises, based on the information provided:
Michael Fassbender — Seen in Shame (2011), Fassbender intentionally performed full-frontal nudity, jokingly citing his mother's complaints about the lack of male nudity in cinema.
George Clooney — Notably used his acceptance speech at the Golden Globes to acknowledge Fassbender's full-frontal scenes, humorously referencing Fassbender’s size.
Aaron Taylor-Johnson — Nude in A Million Little Pieces (2018), where he co-wrote and filmed a nude scene that he found therapeutic and vital for his character; also partially seen in Nocturnal Animals (2016).
Jude Law — Has appeared full-frontal in multiple projects, most recently in Eden (2024), with director Ron Howard noting his past comfort with nudity.
Daryl McCormack — Performed full-frontal in Good Luck to You, Leo Grande (2022), after rehearsing entirely nude with co-star Emma Thompson and director Sophie Hyde.
Jack O'Connell — Iconic for his nude scenes in Starred Up (2013), including a shower scene shot in cold Belfast.
Tom Hardy — Has filmed several nude scenes, including in Bronson (2008) and Taboo (2017). Hardy prefers more nudity in his roles, often pushing for it.
Eric Balfour — Appeared fully nude in Lie with Me (2005), in a scene involving real, unsimulated sex.
Cooper Koch — Showed himself fully in Swallowed (2022) and a shower scene in Monster (2024), expressing no hesitations despite family concerns.
Barry Keoghan — Danced in his birthday suit at the end of Saltburn (2023), citing nervousness over dancing more than nudity.
Jack Reynor — Shot a full-frontal nude scene in Midsommar (2019), advocating for its importance within the story.
Chris Pine — Had a brief nude scene in Outlaw King (2018), openly discussing the double standards around male nudity.
Diego Luna and Gael García Bernal — Both appeared nude in Y Tu Mamá También (2001), serving a narrative purpose that transcended mere exhibitionism.
Kevin Bacon — Fully nude in Wild Things (1998), with a controversial, cut scene involving a kiss with Matt Dillon.
Ewan McGregor — Frequently appears nude in films like Trainspotting (1996) and Velvet Goldmine (1998), motivated by his love of being naked and his beliefs about reflecting human nature on screen.
These actors have embraced full-frontal scenes as a form of authentic storytelling, often doing their own on-screen nudity without prosthetics, in the name of artistic integrity.