Is that a little Russian custom? Hmm?

Sonia:

[to Chamerace, who has entered his bedroom to find her naked in his bed]
Stay out of here. Stay out of here! Arsène Lupin:
How do you do? Sonia:
Close that door! Arsène Lupin:
Certainly. [closes door, staying inside the room] Sonia:
Won't you please go? Arsène Lupin:
Certainly. But first, let me ask, how do you like my bed? Sonia:
Well, I didn't mean to, really. I was cold. Arsène Lupin:
Oh, yes, it is a cold night for May. However, don't you think Paris is charming in the spring? Sonia:
Well, I prefer Russia. You see, I come from there. Arsène Lupin:
Really? How delightful! I have a passion for caviar. Was your father, the general - I presume your father was a general? Sonia:
Of the Imperial Army. Arsène Lupin:
Ah, yes. Was your father, the general, fond of caviar? Sonia:
He ate it on pancakes, for breakfast. Arsène Lupin:
Did he? [They laugh] Arsène Lupin:
Stay for breakfast. We'll have caviar. Sonia:
Sir, aren't you overstepping the bounds of convention? Arsène Lupin:
My dear lady, didn't you leave those behind when you stepped into my bed? Sonia:
Oh, I assure you, my being here is no pleasure. Arsène Lupin:
Ah, but the night is still young. Sonia:
Oh, sir! [she re-arranges herself in the bed, and Chamerace can see her naked back] Arsène Lupin:
Pardon me, but I think your dress has slipped Sonia:
I haven't any on. Arsène Lupin:
Is that a little Russian custom? Hmm?