Just One Time is a 1999 feature length comedy film, written and directed by Lane Janger. It is also a 1998 short film by the same director on which the long feature was based on.
Film is about sexual orientation plays. The fiancee of a fireman reluctantly agrees to participate in a menage a trois with another woman, a sexual fantasy of his. She agrees to the arrangement, but insists to turn the table on him. She suggests that he agrees to reciprocate by having a relationship with another man for one time. This ultimately puts the impending marriage of the two in jeopardy.
Source: Wikipedia