Why my boyfriend wants me to speak other language during sex?

Anonymous
I am czech and his native language is English but for some reason he wants me to speak czech during sex even if he doesn't understand anything! Is just his thing maybe? But for me it feels a little rare because he doesn't understand what i am saying. He even like it to hear me speaking on the phone in czech. Is rare?
Why my boyfriend wants me to speak other language during sex?
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