וַיִּבְרָא אֱלֹקים אֶת־הָאָדָם ... זָכָר וּנְקֵבָה בָּרָא אֹתָם׃
And God created man in His image, ... male and female He created them. (Gen 1.27)
Rashi brings Midrashim:
But according to a Midrashic explanation, He created him at first with two faces, and afterward He divided him. (Genesis Rabbah 8:1 and see Eruvin 18a)
Adam was very upset not having a spouse and was very happy to meet one after G-d split them apart (acc. to that Midrash). That implies he wasn't aware of his other half.
Why, weren't they symmetrical, wasn't the other, feminine, part alive and talking? What did Adam think his back was?