Creating Adam and Eve was the initial creation of the human race. But the human race continues to be created. Humans have been endowed with God's power to create, which is the greatest power He could give to His children. Heavenly Father views the creation of bodies for His spirit children as very important, and expects us to give it the reverence and respect that it deserves. This is why there are such strict laws surrounding that power. Laws which unfortunately are not followed by many in this day. Still, in the LDS Church we believe in those laws and support them and abide by them.
I looked up to see what some of our brethren have said, and I couldn't pick just one or two things from this site, so I'm sharing all of it. Sorry--it's perfectly worded! I'm not a blind obedience follower. I test and pray about what they teach. And the Spirit speaks the truth of it to me. So forgive me that there are times that I don't put what they say into my own words, since what they said is so much better in the original:
Essential to God’s Plan
A Higher Standard
Commanded by God
Co-Creators with Heavenly Father“The most sacred of all our divine powers is to become a co-creator with Heavenly Father in providing physical bodies for His spirit sons and daughters and in establishing a righteous and Christ-centered family,” Elder Bednar says. “Nothing is more holy; nothing deserves more reverence; nothing is more central to the plan of happiness.”
But lest you think the only Creation occurring still today is children, here is another quote from Elder Nelson's talk that explains we have more responsibilities:
We are to be creators in our own right—builders of an individual faith in God, faith in the Lord Jesus Christ, and faith in His Church. We are to build families and be sealed in holy temples. We are to build the Church and kingdom of God upon the earth. We are to prepare for our own divine destiny—glory, immortality, and eternal lives. These supernal blessings can all be ours, through our faithfulness.