YOU SAID:
hey mum asked the girl tentatively why do boys have testicles
INTO JAPANESE
ねえお母さん、男の子になぜ睾丸があるの?
BACK INTO ENGLISH
Hey mom, why do boys have testicles?
INTO JAPANESE
お母さん、どうして男の子に睾丸があるの?
BACK INTO ENGLISH
Mom, why do boys have testicles?
INTO JAPANESE
ママ、どうして男の子には睾丸があるの?
BACK INTO ENGLISH
Mom, why do boys have testicles?
That didn't even make that much sense in English.