Summary: The call to purity must be iterated in this day if the people of God are to enjoy His power.
“Let marriage be held in honor among all, and let the marriage bed be undefiled, for God will judge the sexually immoral and adulterous.” 
Listening to contemporary sociologists, one would conclude that marriage is a dying institution. Actually, one need not listen to sociologists to draw such a negative conclusion—the incessant push to redefine marriage is indicative of a serious problem in our world. First, the push was to broaden the concept to permit same-sex marriage. The argument was that if two people loved one another, who were we to doubt their love? The concept of marriage was solely as an expression of the means by which one gratified his/her personal desires. Thus, whether we realised the transformation or not, marriage was redefined.
The natural fallout from this redefinition was as predictable as it was inevitable. If all that was required for marriage was an expression of love, then why couldn’t multiple individuals enter into marriage? And if multiple individuals could enter into marriage, who was to say that children should be kept from marriage? And if children could be permitted to enter into marriage, then why not animals? The concerns that were expressed by Justice Antonin Scalia in Lawrence v. Texas  are being realised today, and no moral arguments remain to delay the inevitable. Soon, the western nations will be indistinguishable from Sodom and Gomorrah.
The effort to redefine sexual morality is as old as sin itself. Such danger was apparently looming when the writer of the Letter to Hebrew Christians drafted the missive. As that unknown writer drew his letter to a conclusion, he pointedly addressed the threat in succinct fashion. The inclusion of this warning should not be seen as superfluous; rather, it arises from a constant danger for Christians. His cautionary statement serves as the basis for our study today.
LET MARRIAGE BE HELD IN HONOUR AMONG ALL. If marriage is to be held in honour, we must know what marriage is. In order to know what marriage is, we should ask Him who gave marriage to mankind what His intent was. Thus, we find ourselves directed to the first marriage. When God had completed creating the heavens and the earth, filling the earth with the various animal kinds, He created Adam. We read, “The LORD God formed the man of dust from the ground and breathed into his nostrils the breath of life, and the man became a living creature” [GENESIS 2:7].
The acme of God’s creation was man; the man was unique, though it appears that he didn’t realise his uniqueness. God revealed man’s unique character through a fascinating means. The account of that divine revelation is provided in GENESIS 2:18-20. “The LORD God said, ‘It is not good that the man should be alone; I will make him a helper fit for him.’ Now out of the ground the LORD God had formed every beast of the field and every bird of the heavens and brought them to the man to see what he would call them. And whatever the man called every living creature, that was its name. The man gave names to all livestock and to the birds of the heavens and to every beast of the field. But for Adam there was not found a helper fit for him.”