God is the designer of sex; like an architect, He designed the male and female bodies as miraculous things of beauty. When I really think about that, I do not see how anyone could think we "evolved"
from something else.
Matthew 19:4-6: "Haven't you read," he replied, "that at the beginning the Creator 'made them male and female,' and said, 'For this reason a man will leave his father and mother and be united to his wife, and the two will become one flesh'? So they are no longer two, but one. Therefore, what God has joined together, let man not separate."
Mark 10:6-9 substantiates the verses above: "But at the beginning of creation God 'made them male and female.' 'For this reason a man will leave his father and mother and be united to his wife, and the two will become one flesh.' So they are no long two, but one. Therefore, what God has joined together, let man not separate."
The two will become one flesh...........My interpretation of that is that spiritually as well as physically they become one; while they are two separate individuals, at the same time they are one unit. God warns that no one is to try to break that covenant.
1 Corinthians 7:3-5---"A husband should fulfill his marital duty to his wife, and likewise a wife to her husband. A wife does not have authority over her own body, but her husband does. Equally, a husband does not have authority over his own body, but his wife does. Do not deprive one another--except when you agree, for a time, to devote yourselves to prayer. Then come together again; otherwise, Satan may tempt you because of your lack of self-control."
In this passage Paul is not only commanding/advising married couples to have sex, but he tells the woman her husband has control over her body, and likewise, the wife has control over her husband's. He instructs them not to withhold sex from one another unless it is for prayer (and fasting) because Satan may tempt them.
Now, I know how some women are ( I say "women" because I have never heard of a husband giving an excuse to beg off sex.). If they are angry, they often want to "get back" at their husbands by withholding sex; thus, the "Not tonight, honey; I have a headache" cliché. That is wrong, wrong, wrong.....and I will go a step further and say they are asking for trouble because they are leaving the door open for Satan to tempt their husband with another woman. God created the male and female bodies to complement each other, and that makes sex a huge part of marriage.
Next: The Song of Solomon....up close