YOU SAID:

I wanted to find out the gender of her donkey.

INTO JAPANESE

彼女のロバの性別を知りたかったのです。

BACK INTO ENGLISH

I wanted to know the sex of her ass.

INTO JAPANESE

私は彼女のお尻の性別を知りたがっていました。

BACK INTO ENGLISH

I wanted to know the sex of her ass.