"in the sack" in Chinese (Traditional)
在牀上性方面（口語）
Definition
'In the sack' 是一個非正式說法，通常指在牀上，特別指睡覺或更常指性生活。
Usage Notes (Chinese (Traditional))
十分口語化，多指性生活，有時也僅指睡覺。僅用於非正式場合，正式場合應避免使用。
Examples
He is already in the sack because he was tired.
他已經**在牀上**了，因為太累了。
Are you still in the sack? It's almost noon!
你還**在牀上**嗎？都快中午了！
They spent the whole morning in the sack.
他們整個早上都**在牀上**。
Rumor has it he's amazing in the sack.
聽說他**在牀上**非常厲害。
I love a lazy Sunday just chilling in the sack.
我喜歡在週日悠閒地**待在牀上**放鬆。
They seemed to get along well, both outside and in the sack.
他們無論在外還是**在牀上**都很合拍。