[請益] girl talk, girl's talk, or girls' talk?

[thebeginning (當我們宅在一起)]

想請問一下  要表達說聊天的內容只限於女孩子聽(聊)
那麼我是該講 girl talk  還是 girl's talk?
至於要用寫的話是 girl's talk 還是 girls' talk呢?
謝謝



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