The husband should fulfill his marital duty to his wife, and likewise the wife to her husband. 4The wife's body does not belong to her alone but also to her husband. In the same way, the husband's body does not belong to him alone but also to his wife. 5Do not deprive each other except by mutual consent and for a time, so that you may devote yourselves to prayer. Then come together again so that Satan will not tempt you because of your lack of self-control.
1 Corinthians 7:3-5 (New International Version)
When reading this passage, it seems that the Apostle Paul was talking about expectations for sex in marriage. Neither the husband nor the wife has complete control in their body. In today's world that flies in the face of what we are taught.
Since I am male, I will speak from a purely male perspective. Men are taught that the woman has final say in sex. If a woman is not up to it, does not want to do certain acts, or whatever, then the man has to respect her wishes. Before anyone goes onto a rant about rape and certain kinks, in other writings Paul instructs the husband to love his wife like Jesus loves the church. I am not talking about that kind of stuff. I am talking about control. Who is in control? Does the man get a vote? How far can things be pushed?
In reading the letter from Paul, sex is confined to marriage only. Sex is a way of strengthening the bonds of marriage and way to keep sexual immorality from creeping into the marriage. Despite what some faiths or denominations teach, Paul says that sex is not just about procreation but about bonding through recreation. Sex is fun. What does that mean about someone that is a killjoy? The fun disappears. It becomes another chore, like taking out the garbage.