God's way is always best! Why? Because God is good; He is loving; He is compassionate and patient and longsuffering - and we are the objects of His affection!
His ways are best because His ways are perfect. Because there is no sin in Him, everything He does is perfect.
Consider for example what sex produces within God's perfect plan: a monogamous marriage where both parties are seeking to live in accordance with God's plan:
Now consider what sex produces outside God's perfect plan: any sexual relations outside of a monogamous marriage relationship:
God's way always brings about good results, rewards, blessings, joy, harmony, peace, fulfillment, etc.
Deviating from God's way always brings about painful consequences, discipline, sorrow, disharmony, strife, emptiness, longing, etc.
Abstinence until marriage is God's way.