Another one where the two women are the main players and “the guy” is a generic gender representative: Bound.
Death Becomes Her is another example.
Garnet, Amethyst, and Pearl . . . and Steven!
(OK, not a film, but I couldn’t resist.)
For a 2Gls-1Gy dynamic in film, there’s My Best Friend’s Wedding.
To be fair, if you Google for “linoleum” you get porn too.
No, you don’t. I realize that you were joking, but let’s be honest here. I do a lot of Googling to answer questions on the SDMB, and I very rarely get porn websites from those searches. Incidentally, my apologies to Richard John Marcej. I either missed the post where he mentioned Death Becomes Her or I forgot about it while I was doing some searches for other things.
And the original on which it’s based
**Man About the House
**
Wicked?
Elphaba & Galinda & Fiyero.
Good catch!
Despicable Me has one guy and three girls. (Orphans he tries to adopt). Brave has a mother, daughter, and father as the main players. Enchanted has the woman, the man, and the man’s daughter as the main players. Lilo and Stitch has two girls (sisters) and one male alien monster.
Infamously, there was Two Girls and one Cup.
Wild Things
Diabolique.
Also, Fried Green Tomatoes in a funky way. The “modern” part with Evelyn, Ninny, and Evelyn’s husband…and the flashbacks with Idgie, Ruth, and Ruth’s husband (Frank?).
Thelma and Louise? It’s been a long time since I saw it, but wasn’t a large part of the movie spent with the two women and Brad Pitt?
Cagney and Lacey, and their boss, a guy.
Film: The Truth About Cats and Dogs
Television: iCarly
No Exit by Sartre (the one that gave us the quotation “Hell is other people”) is one man, two women for the vast majority of the play.
In The Legend of Korra, the love triangle consists of a guy, Mako, who likes two different girls, Korra and Asami. Eventually they decide they’re better off without him and end up as a couple themselves. 
He was a glorified extra in that movie. Possibly on screen for less than one minute.