noun
threesome (sexual)
Colloquial term for a sexual encounter involving three people. The 'P' stands for 'people' or 'persons'.
彼氏が3Pに興味があるって言ってたけど、私はちょっと抵抗がある。
My boyfriend said he's interested in a threesome, but I'm a bit hesitant.
ネットで3Pの体験談を読んだ。
I read about someone's threesome experience online.