ESV - 8 And the Lord God planted a garden in Eden, in the east, and there he put the man whom he had formed.
For follow-up discussion and general commentary on the topic. Comments are sorted chronologically.
Adam, Man, was created first. In Genesis 2:20-21 Man named all the creatures and was given dominion over the earth. God saw that Man had no suitable "helper," so God put man to sleep, removed a rib of Man to make the woman.
Also, as a result of the woman eating the apple, Genesis 3:16b states, "God said to the woman,........Your desire will be for your husband, and he shall rule over you."
Additionally, in a secular sense, when two people come together in biz, or partnership, things run smoother if only one is the leader....God knew this.