The girl is a blond girl and two guys are in love with her and they end up been together all of them she falls in to a toilet because the guys left the seat up I think came out in the 90s or 2000 something..

Perhaps Threesome (http://www.imdb.com/title/tt0111418/)

It's called "Splendor" (1999)
Starring Kathleen Robertson Johnathon Schaech Matt Keeslar
;-)