noun
swinger party
A social gathering where participants engage in consensual partner swapping or group sexual activities. Loanword from English; used in modern Japanese with the same meaning.
彼らは週末にスインガーパーティーに参加した。
They attended a swinger party over the weekend.
Variant with interpunct; less common but seen in some contexts.
Loanword from English 'swinger party'.