In the screenplay Chinatown, what does the Chinese joke mean?!

Question: you know how in hte screenplay gittes tells a joke about "screwing liek a chinaman"?
i don;t get..
help please

---

---

Answers: you know how in hte screenplay gittes tells a joke about "screwing liek a chinaman"?
i don;t get..
help please

---

---

It implies the wife has carnal knowledge of "Chinamen." Which was sort of what the husband was going for: the taking a break in the middle was portrayed to him as the way "Chinamen" do it. Her response both confirmed that and implied he'd been cuckolded.

---

---

---