Sex is that which is sacred to God. It was God's gift for humanity to show love to each other, which can only be done within the confines of marriage. However, it has been used as a tool for self-seeking pleasure or earthly comfort. That is the way the world sees sex.
The world also loves to impose its mantra which purports that as long as there is mutual consent between two adults, there is nothing wrong with it. This is a perversion of the meaning of love, which is not about "consent" but self-sacrifice. The world makes sex to be a tool from which one gains what one wants, and chooses only what it likes about sex with others.
As such, it disdains the teaching in 1 Corinthians 7:4: "The wife hath not power of her own body, but the husband: and likewise also the husband hath not power of his own body, but the wife." Yet, the world loves to attack the Bible for being "sexist" and unfair against either sex, (depending on what one's sex is).