One-night stand
WordNet
noun
(1) A performance in one place on one night only
(2) A brief sexual encounter lasting only for a single night
"He ran through a series of loveless one-night stands"
WiktionaryText
Noun
- An occasion when a performer or team of them (especially in vaudeville) expects to perform at a theater for a single evening.
- A single sexual encounter between two individuals, where at least one of the parties has no immediate intention or expectation of establishing a longer-term sexual or romantic relationship. As the phrase implies, the relationship lasts for only one night.