We live in a world reminiscent of the days of Sodom and Gomorrah. Man is always tilted over to sexual desires because the conditioning by the environment, the media etc is heavy. Singular reason for this is what the bible calls the 'Spirit of the World'. 1 Corinthians 2:12
Now we have received, not the spirit of the world,...
"Now we have received, not the spirit of the world, but the spirit which is of God; that we might know the things that are freely given to us of God."
1 Corinthians 2:12
The whole purpose of sex (physical activity related and often leading to sexual intercourse) and thanks to the spirit of the world potentiated by the devil, has been thwarted God's purpose. So in today's world sex is a fun activity, anyone can casually indulge in, like for example; playing tennis, enjoying a nice meal, watching a movie etc.
It is often said that "when the purpose of a thing is not know, abuse is inevitable". Okay, so why sex? What was on God's mind? To make man naturally attracted to the woman's body and vice versa just to tempt them and know who can overcome? Or make the act enjoyable so they be pre-occupied with his original instruction; "replenish the earth"?
When we study the bible we find what God thinks about sex. It's so clear and it is relevant to every generation.
"Therefore shall a man leave his father and his mother, and shall cleave unto his wife: and they shall be one flesh. And they were both naked, the man and his wife, and were not ashamed."
If you want to find God's original idea about anything, go to the Book of Genesis. From the fore going verse, we can pick two things; firstly the 'cleaving to each other and becoming one flesh'. Let us remember, that God places huge importance on symbols and symbolic meaning for example; the Passover feast was a reminder and a symbol of the passing over of the death angel in the times of Moses, also in the new testament we have the communion, symbolic of the sacrifice the Lord Jesus paid for us with his dear blood and flesh.
Sex is symbolic of what God said, "the two shall become one flesh". When married, a man has sex with his wife as a reminder to them, of the absolute oneness of their bodies and spirit in the eyes of God. It is important also to note that the symbols in the bible have power for example; when we take the holy communion in the consciousness of what it means. The simple activity results in the healing of our bodies, praise God!
The effect of sex on the married couple is what God already said! "They shall become one", their relationship and commitment to each other is strengthened. Couples grow apart cause they don't understand things from God's point of view and so sex for them is trying to please the other person or themselves.
This pleasure they keep seeking results in adultery, yet the word says; (Hebrews 13:4) Marriage is Honourable in all, and the bed undefiled: but whore-mongers and adulterers God will judge. All of this is cause of the seriousness God gives to this issue.
Now, what of a man and woman that have sex, who are not married? Well firstly that's 'fornication.' The word says in 1 Corinthians 6:18 Flee fornication... , But what's the implication? Paul says in 1 Corinthians.
"All things are lawful unto me, but all things are not expedient: all things are lawful for me, but I will not be brought under the power of any. Meats for the belly, and the belly for meats: but God shall destroy both it and them. Now the body is not for fornication, but for the Lord; and the Lord for the body."
1 Corinthians 6:12-13
Interestingly Paul implies that to himself it is lawful to fornicate, yet he says it's not expedient and he tells why, it is because the body is for the Lord and the Lord for the body. Meaning I won't do it cause my body belongs to the lord and in doing so I desecrate the lord's body, his temple. That's the implication of fornication, a defiled temple!
God's idea of sex also included to bless the couple with children if they so desired.
'Lo, children are an heritage of the Lord : and the fruit of the womb is his reward. '
When meaningless sex, that is not symbolic of marital oneness and does not appreciate the gift of God that results is the order of the day, it becomes the devil's gift, not God's. Sex is enjoyable because that's how God designed it, it is one of the joys in the relationship as the act of sex is a consummation of the love between couples.
Those who move from person to person in search of the pleasures of sex the bible says; Hebrews '... but whore mongers and adulterers God will judge.'
"Marriage is Honourable in all, and the bed undefiled: but whore mongers and adulterers God will judge."
God will Judge not because sex is a bad thing but because it was not their invention and yet they abused it. It's like I took your toy and broke it! That's why satan will be judged, he took God's creation and messed it up.
Don't give yourself over to the spirit of the world, having sex at will, with just about anyone. No! God gave you your hormones to control and direct. You are to be led by the spirit not your genitals. As Christ loves the church and takes delight in his church, you are to wait for the appointed time and give all your love, affection and your body to the one who God predetermined.
In conclusion the word encourages us in 1 Corinthians 6:20 to "glorify God in your body, and in your spirit, which are God's."