"But as the days of Noah were, so shall also the coming of the Son of man be. For as in the days that were before the flood they were eating and drinking, marrying and giving in marriage, until the day that Noe entered into the ark, And knew not until the flood came, and took them all away; so shall also the coming of the Son of man be." - Matthew 24:37-39
"And as it was in the days of Noe, so shall it be also in the days of the Son of man. They did eat, they drank, they married wives, they were given in marriage, until the day that Noah entered into the ark, and the flood came, and destroyed them all. Likewise also as it was in the days of Lot; they did eat, they drank, they bought, they sold, they planted, they builded; But the same day that Lot went out of Sodom it rained fire and brimstone from heaven, and destroyed them all. Even thus shall it be in the day when the Son of man is revealed." - Luke 17:26-30
We know from studying the different dispensations that Jesus Christ will return at the end of the 7-Year Tribulation (Rev. 19:11-16). We must keep Matthew 24 and Luke 21 in context in order to understand when Jesus is saying that these events will take place.
Matthew 24 and Luke 21 line up with the events in Revelation chapter 6 which take place after the Rapture of Revelation 4:1. These events encompass the entire Tribulation period and culminate with the return of Christ in Matthew 24:39, Mark 13:26, Luke 17:30, and Revelation 6:16.
The context is clearly the Tribulation period.
Why would Jesus talk about simple things such as eating, marrying, etc.? On the surface, those are occurrences that have taken place in every time period. Was Jesus saying that before He returns that daily life will be nothing more than the status quo? Of course not. We know this isn't the case by simply studying the many prophecies contained in the Old and New Testaments to see that life will be terrible during the time of Jacob's Trouble (Jer. 30:7). There will be famines, persecutions and beheadings, nuclear war, economic destruction, and more. There is definitely something more to the days of Noah and Lot than simply eating food, making purchases, and getting married.
Jesus defined the days of Noah ending when he entered the ark. This account is found in Genesis chapter 6 and gives a graphic description of how mankind was so corrupt that "...every imagination of the thoughts of his heart was only evil continually" (Gen. 6:5). The people during that time only wanted to sin and do what was opposite of God's design. God created mankind to be male and female, one man and one wife (Gen. 2:24). Genesis chapter 6 marks the beginning of breeding between fallen angels and mankind.
"That the sons of God saw the daughters of men that they were fair; and they took them wives of all which they chose. And the Lord said, My spirit shall not always strive with man, for that he also is flesh: yet his days shall be an hundred and twenty years. There were giants in the earth in those days; and also after that, when the sons of God came in unto the daughters of men, and they bare children to them, the same became mighty men which were of old, men of renown." - Genesis 6:2-4
Notice that it was once the fallen angels began having sexual relations with women that God set a 120-year countdown to the Flood. After the Flood, the fallen angels reproduced with humans again (Num. 13:33; Deut. 1:28, 2:10-11, 21, 3:11; 1 Sam. 17:1-58).
If human-angel hybrids once again existed in the post-Flood world, why did the sins of Sodom and Gomorrah stand out? There is the theory that it was the sin of homosexuality that caused the destruction, but if that were the case, then why hasn't God wiped out more cities that have been rampant with this lifestyle?
Remember: the Bible will always interpret the Bible.
"And there came two angels to Sodom at even; and Lot sat in the gate of Sodom: and Lot seeing them rose up to meet them; and he bowed himself with his face toward the ground; And he said, Behold now, my lords, turn in, I pray you, into your servant's house, and tarry all night, and wash your feet, and ye shall rise up early, and go on your ways. And they said, Nay; but we will abide in the street all night. And he pressed upon them greatly; and they turned in unto him, and entered into his house; and he made them a feast, and did bake unleavened bread, and they did eat. But before they lay down, the men of the city, even the men of Sodom, compassed the house round, both old and young, all the people from every quarter: And they called unto Lot, and said unto him, Where are the men which came in to thee this night? bring them out unto us, that we may know them." - Genesis 19:1-5
The men of Sodom wanted to rape God's angels! Their sin went beyond homosexuality. Jude stated that these men "...as Sodom and Gomorrha, and the cities about them in like manner, giving themselves over to fornication, and going after strange flesh, are set forth for an example, suffering the vengeance of eternal fire" (Jude 7).
Fornication refers to any sort of sexual activity outside of what God has ordained which includes homosexuality (see lesson). Strange flesh refers to different species (Gen. 2:23,1 Cor. 15:39). Furthermore, Jesus said in Matthew 24:38 that people will be "eating and drinking". Whenever this phrase is used in the Bible, it often refers to celebration and enjoyment (1 Kings 4:20, Ecc., 5:18, Is. 22:3).
Jesus, in Matthew 24 and Luke 21, described the Tribulation period to be a time when mankind will celebrate their communion with fallen angels. Men and women will relish in every type of sexual perversion possible.