Eddy en Stuart delen een studentenwoning. Door een misverstand in de administratie wordt Alex, een studente, hun derde kamergenoot. Al snel valt Alex voor de rustige Eddy, en Stuart ziet Alex wel zitten. Eddy zit in de knoop met z'n homoseksuele gevoelens en daarbij gaat hij nog eens warme gevoelens koesteren voor Stuart. De drie kunnen het als vrienden goed met elkaar vinden, maar sommige gevoelens gaan voor problemen zorgen.
Nee, helaas is Threesome nog niet beschikbaar op Netflix in Nederland.
| Camera | Alexander Gruszynski | Director of Photography |
| Editing | William C. Carruth | Editor |
| Production | Brad Krevoy | Producer |
| Directing | Andrew Fleming | Director |
| Directing | Phil Robinson | Second Assistant Director |
| Crew | Ralph Sall | Executive Music Producer |
| Sound | Thomas Newman | Original Music Composer |
| Writing | Andrew Fleming | Writer |
| Costume & Make-Up | Deborah Everton | Costume Design |
| Sound | Bill Bernstein | Music Editor |
| Sound | Giovanni Di Simone | Sound Mixer |
| Production | David Stein | Associate Producer |
| Costume & Make-Up | Clare M. Corsick | Key Hair Stylist |
| Costume & Make-Up | Patty York | Key Makeup Artist |
| Crew | BJ Davis | Stunt Coordinator |
| Sound | David C. Eichhorn | Sound Effects Editor |
| Sound | Jeffrey Pollack | Music Consultant |
| Crew | George Gale | Post Production Supervisor |
| Sound | William C. Carruth | Supervising Sound Editor |
| Art | Ivo Cristante | Production Design |
| Art | Ken Larson | Art Direction |
| Art | Tim Colohan | Set Decoration |
| Camera | Bruce Alan Greene | Steadicam Operator |
| Production | Robyn Ray | Casting |
| Production | Ed Mitchell | Casting |
| Production | Tracie Graham-Rice | Unit Production Manager |
| Art | Eric London | Set Dresser |
| Camera | David Garden | Second Assistant Camera |
| Directing | Richard J. Levin | Second Assistant Director |
| Sound | Tom Caton | Boom Operator |
| Sound | Paul Vik Marshall | Boom Operator |
| Sound | James Battersby | Boom Operator |
| Costume & Make-Up | Sonya Ooten | Wardrobe Supervisor |
| Directing | Robert A. Neft | Second Second Assistant Director |
| Camera | Jacek Laskus | Director of Photography |
| Directing | Jack Breschard | First Assistant Director |
| Production | Mike Johnson | Extras Casting |
| Production | Jennifer Sloan | Casting Assistant |
| Directing | Jack S. Krevoy | Second Second Assistant Director |
| Directing | Matt Hinkley | First Assistant Director |
| Camera | Ray Milazzo | Second Assistant Camera |
| Art | Raymond Consign | Storyboard Artist |
| Directing | Robin Winter | Second Second Assistant Director |
| Sound | Mark Weingarten | Production Sound Mixer |
| Camera | Katherine M. Butler | First Assistant Camera |
| Directing | Kate Morrison | Script Supervisor |
| Art | Bill Staples | Set Decoration |
| Camera | Abe Perlstein | Still Photographer |
| Costume & Make-Up | Brenna Gibson | Costumer |
| Directing | Martin Kitrosser | Script Supervisor |
| Art | Tim Colohan | Art Direction |
| Camera | Chris Lombardi | First Assistant Camera |
| Sound | Ron Bedrosian | Foley Mixer |
| Costume & Make-Up | Eryn Krueger Mekash | Makeup & Hair Assistant |
| Sound | Lynn Bopeley | Boom Operator |
| Production | Dawn Thomas | Production Coordinator |
| Sound | Robert W. Glass Jr. | Sound Re-Recording Mixer |
| Sound | Bill Bell | Foley Supervisor |
| Sound | Tim Chilton | Foley Artist |
| Sound | Jill Schachne | Foley Artist |
| Sound | Richard D. Rogers | Sound Re-Recording Mixer |
| Costume & Make-Up | Cheryl Voss | Key Makeup Artist |
| Editing | Tom Dailey | Assistant Editor |
| Sound | Frank Fleming | Sound Recordist |
| Directing | BJ Davis | Second Unit Director |
| Production | Steven Stabler | Producer |
| Production | Cary Woods | Executive Producer |
| Production | Bradley Jenkel | Co-Producer |
| Production | Tracie Graham-Rice | Line Producer |
