The Gemara brings in the incident of a king gathering 72 sages to translate the Torah to Greek. They all came with the idea to change some Psukim. One of them was
זָכָ֥ר וּנְקֵבָ֖ה בְּרָאָ֑ם וַיְבָ֣רֶךְ אֹתָ֗ם וַיִּקְרָ֤א אֶת ־שְׁמָם֙ אָדָ֔ם בְּי֖וֹם הִבָּֽרְאָֽם
He created them male and female; He blessed them and called their name Adam, on the day they were created.
The Sages changed it to
זָכָר וּנְקֵבָה בְּרָאוֹ
'Male and female, he created him'
Rashi says it is to show that they were made conjoined, and Hashem split them. But what is the big deal if they think they were made separate?